Schedule of Regulatory Assets [Table] Schedule of Regulatory Assets [Table] Asset Retirement Obligation Roll Forward Analysis [Table] Asset Retirement Obligation Roll Forward Analysis [Table] A table for the reconciliation of the nuclear decommissioning asset retirement obligation from the beginning of a period to the end of a period. Open Asbestos Liability Claims Loss Contingency, Pending Claims, Number Current Period Provision for Expected Credit Losses Provision for uncollectible accounts Accounts Receivable, Credit Loss Expense (Reversal) Related Party Transactions [Abstract] Related Party Transactions [Abstract] Income Taxes Receivable, Noncurrent Income Taxes Receivable, Noncurrent Small Commercial & Industrial [Member] Small Commercial & Industrial [Member] Small Commercial & Industrial [Member] Finance Lease, Right-of-Use Asset, after Accumulated Amortization Finance Lease, Right-of-Use Asset, after Accumulated Amortization Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Table Text Block] This element may be used to capture the assumptions used to calculate the benefit obligation. Debt Instrument [Axis] Debt Instrument [Axis] Fair value adjustment Long-term debt (including amounts due within one year) Debt Instrument, Fair Value Disclosure Fair Value Measurement [Domain] Fair Value Measurement [Domain] 2026 Finance Lease, Liability, to be Paid, Year Four Depreciation Depreciation Contract with Customer, Prior Year Contract Revenues Recognized in Current Year [Table Text Block] Contract with Customer, Prior Year Contract Revenues Recognized in Current Year [Table Text Block] Contract with Customer, Prior Year Contract Revenues Recognized in Current Year Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Retirement Benefits (All Registrants) Compensation Related Costs, Policy [Policy Text Block] Other Current Assets [Member] Other Current Assets [Member] Guarantee Obligations [Member] Guarantee Obligations [Member] Exelon Energy Delivery Company LLC [Member] Exelon Energy Delivery Company LLC [Member] Exelon Energy Delivery Company LLC [Member] Benefit obligation increase (decrease) reflecting actual census data Increase (Decrease) in Obligation, Other Postretirement Benefits Current State and Local Tax Expense (Benefit) Current State and Local Tax Expense (Benefit) Capital Leased Assets, Gross Capital Leased Assets, Gross 2025 Finance Lease, Liability, to be Paid, Year Three Three Mile Island [Member] Three Mile Island [Member] Three Mile Island [Member] Defined Benefit Plan, Plan Assets, Payment for Settlement Settlements Defined Benefit Plan, Plan Assets, Payment for Settlement Long-Term Marginal State Income Tax Rate [Abstract] Long-Term Marginal State Income Tax Rate [Abstract] Long-Term Marginal State Income Tax Rate [Abstract] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] Secured debt [Member] First Mortgage Bonds [Member] Secured Debt [Member] Not Designated as Hedging Instrument, Economic Hedge [Member] Not Designated as Hedging Instrument, Economic Hedge [Member] Investment, Name [Domain] Investment, Name [Domain] Related Party [Domain] Related Party [Domain] Other available for sale debt security investments Debt Securities, Available-for-Sale Hedging Designation [Domain] Hedging Designation [Domain] Written Communications Written Communications Investment Tax Credit Investment Tax Credit Spent nuclear fuel obligation Spent Nuclear Fuel Obligation, Noncurrent Spent Nuclear Fuel Obligation, Noncurrent Plan Name [Domain] Plan Name [Domain] Energy efficiency and demand response programs Energy Efficiency And Demand Response Programs [Member] Costs related to energy efficiency and demand response programs recorded to a regulatory asset Equity Distribution Agreement Equity Distribution Agreement Equity Distribution Agreement Surety Bond [Member] Surety Bond [Member] Entity Address, State or Province Entity Address, State or Province Pledged Status [Axis] Pledged Status [Axis] Average interest rate on commercial paper borrowings Short-Term Debt, Weighted Average Interest Rate, at Point in Time Long-term Debt, Maturity Date Long-Term Debt, Maturity Date Other comprehensive income (loss), net of income taxes Other Comprehensive Income (Loss), Net of Tax [Abstract] Shares Outstanding, Weighted Average Remaining Contractual Life Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Accounts Payable, Other, Current Accounts Payable, Other, Current Development Projects Asset Retirement Obligation, Liabilities Incurred Member’s equity Members' Equity [Abstract] Actuarial (gain) loss(a) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Restructuring Costs Restructuring Costs SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Operating expenses Costs and Expenses [Abstract] Percentage ownership of consolidated subsidiaries Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions Transaction [Domain] Transaction [Domain] Lender Name [Axis] Lender Name [Axis] Long-Term Marginal State Income Tax Rate Long-Term Marginal State Income Tax Rate [Table Text Block] [Table Text Block] for Long-Term Marginal State Income Tax Rate [Table] Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] March 29, 2024 March 29, 2024 [Member] March 29, 2024 Long-term debt Long-term Debt, Excluding Current Maturities Long-Term Debt, Excluding Current Maturities Non-pension postretirement benefit asset Non-pension postretirement benefit asset Non-pension postretirement benefit asset Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table] Schedule of Deferred Compensation Arrangement with Individual, Share-Based Payments [Table] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Unrealized Gains and (Losses) on Marketable Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Document Type Document Type Average  Service Life (years) Property, Plant and Equipment, Useful Life Customer deposits Contract with Customer, Refund Liability, Current Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Exelon Business Services Co Affiliate [Member] Exelon Business Services Co Affiliate [Member] Exelon Business Services Co Related Party Affiliate Tax credit carryforward Deferred Tax Assets, Tax Credit Carryforwards, General Business Revenue from Contract with Customer (All Registrants) [Abstract] Revenue from Contract with Customer (All Registrants) [Abstract] Revenue from Contract with Customer (All Registrants) [Abstract] Soliciting Material Soliciting Material PECO Energy Co [Member] PECO Energy Co [Member] PECO Energy Co [Member] Included in net income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Public Utilities, Requested Rate Increase (Decrease), Amended, Amount Public Utilities, Requested Rate Increase (Decrease), Amended, Amount Retirement Plan Name [Domain] Retirement Plan Name [Domain] Net increase/decrease due to changes in, and timing of, estimated future cash flows Asset Retirement Obligation, Period Increase (Decrease) Long-term software licensing agreement [Member] Software License Arrangement [Member] Accrued expenses Accrued Liabilities, Current Unsecured notes [Member] Unsecured Debt [Member] Total member’s equity Members' Equity Long-term Debt, Current Maturities Long-term Debt, Current Maturities Long-Term Debt, Current Maturities Accounting Policies [Abstract] Accounting Policies [Abstract] Benefits included in regulatory assets (liabilities) Defined Benefit Plan Regulatory Assets Before Tax The pretax total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in regulatory assets associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. Variable Lease, Cost Variable Lease, Cost Fair value of net plan assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Finance Lease, Liability, Noncurrent Finance Lease, Liability, Noncurrent Other Noncurrent Liabilities [Member] Other deferred credits and other liabilities [Member] Other Noncurrent Liabilities [Member] Disposal Group, Including Discontinued Operations, Assets, Current - Liabilities held for sale Disposal Group, Including Discontinued Operations, Assets, Current - Liabilities held for sale Disposal Group, Including Discontinued Operations, Assets, Current - Liabilities held for sale Changes in Exelon/PHI intercompany money pool Increase (Decrease) Due from Affiliates Income Taxes [Table] Income Taxes [Table] Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Guarantees Other Than Letters Of Credit and Nuclear Insurance Premiums [Member] Guarantees Other Than Letters Of Credit and Nuclear Insurance Premiums [Member] Guarantees other than letters of credit and nuclear insurance, including parental guarantees on behalf of subsidiaries and guarantees on surety bonds, performance contracts, energy marketing contracts, trust preferred securities, leases and indemnifications. 2022 Transmission Formula Rate Annual Update [Domain] 2022 Transmission Formula Rate Annual Update [Domain] 2022 Transmission Formula Rate Annual Update Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Public Authorities & Electric Railroads [Member] Public Authorities & Electric Railroads [Member] Public Authorities & Electric Railroads [Member] Shares Exercisable, Weighted Average Remaining Contractual Life Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Acquisitions of assets and businesses, net Payments to Acquire Businesses, Gross Investment in NDT funds Payments to Acquire Other Investments Recourse Status [Axis] Recourse Status [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] 2025 2025 [Member] 2025 Commonwealth Edison Co [Member] Commonwealth Edison Co [Member] Commonwealth Edison Co [Member] Supplemental Financial Information (All Registrants) Supplemental Financial Information Disclosure [Text Block] Element designated to encapsulate the entire footnote disclosure that provides information on the supplemental income statement, cash flow and balance sheet activities. Mutual Fund [Member] Mutual Fund [Member] AOCI of Investments Unconsolidated Affiliates (b) Accumulated Equity Investment [Member] Unrealized (loss) gain on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Restricted cash [Member] Restricted cash [Member] Restricted cash [Member] Trading Symbol Trading Symbol 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Four Accrued Expenses [Abstract] Accrued Liabilities [Abstract] Transaction Type [Axis] Transaction Type [Axis] Transportation [Member] Transportation [Member] Transportation [Member] New Freedom Switching [Member] New Freedom Switching [Member] New Freedom Switching [Member] Note receivable from affiliates, current Due from Related Parties, Current Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Use Of Estimates (All Registrants) Use of Estimates, Policy [Policy Text Block] Other, Net [Abstract] Other Nonoperating Income (Expense) [Abstract] Expiration Date of Facility [Axis] Expiration Date of Facility [Axis] Expiration Date of Facility Prime Rate [Member] Prime Rate [Member] Regulatory Assets and Liabilities by Year [Axis] Regulatory Assets and Liabilities by Year [Axis] Regulatory Assets and Liabilities by Year Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current Proceeds from short-term borrowings with maturities greater than 90 days Proceeds from Short-Term Debt, Maturing in More than Three Months Large Commercial & Industrial [Member] Large Commercial & Industrial [Member] Large Commercial & Industrial [Member] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Regulated Operation [Member] Regulated Operation [Member] Basis Points - ComEd Symmetrical Performance Adjustments Basis Points - ComEd Symmetrical Performance Adjustments Basis Points - ComEd Symmetrical Performance Adjustments Gain on sales of assets and businesses Gain (Loss) on Disposition of Other Assets Separation Cash Payment Separation Cash Payment Separation Cash Payment Payroll Other Labor-related Expenses MGP remediation costs Environmental Restoration Costs [Member] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Increase (Decrease) in Regulatory Assets and Liabilities Increase (Decrease) in Regulatory Assets and Liabilities Impact of adoption of Recognition and Measurement of Financial Assets and Liabilities standard Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Other Commitment, to be Paid, Year Four Other Commitment, to be Paid, Year Four Corporate, Non-Segment [Member] Corporate, Non-Segment [Member] Deferred Compensation Liability, Current and Noncurrent Deferred Compensation Liability, Current and Noncurrent Regulatory Liabilities [Line Items] Regulatory Liability [Line Items] Rate-regulated utility revenues [Member] Public Utilities [Member] Ownership [Domain] Ownership [Domain] Entity Interactive Data Current Entity Interactive Data Current Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Membership Interest [Member] Membership Interest [Member] An ownership interest in a limited liability company. Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Fair value of long-term debt Fair Value Of Long Term Debt [Member] Adjustment to fair value acquired debt; treated as deferred charges Regulatory Matters Additional Narrative Information [Table] Regulatory Matters Additional Narrative Information [Table] Regulatory Matters Additional Narrative Information [Table] Related Party Transactions - Current Receivables From/Payables To Affiliates [Table Text Block] Related Party Transactions - Current Receivables From/Payables To Affiliates [Table Text Block] Related Party Transactions - Current Receivables From/Payables To Affiliates [Table Text Block] Total deferred debits and other assets Deferred Costs and Other Assets Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense Defined Benefit Plan Pension Plans With Benefit Obligations In Excess Of Plan Assets [Axis] Defined Benefit Plan Pension Plans With Benefit Obligations In Excess Of Plan Assets [Axis] Benefit obligation scenarios that the lines items in a table could be reported under. Receivable Type [Axis] Receivable Type [Axis] Class of Stock [Axis] Class of Stock [Axis] Commercial Paper Commercial Paper Thereafter Long-Term Debt, Maturity, after Year Five Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Other allowance for credit losses Allowance for Credit Loss, Receivable, Other, Current Return on borrowed funds Return on borrowed funds [Member] Return on borrowed funds Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Current assets Assets, Current [Abstract] FMB490Feb2033 FMB490Feb2033 [Member] FMB490Feb2033 Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Claim Type [Axis] Claim Type [Axis] Claim Type Shares Exercisable, Weighted Average Exercise Price (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Leases of Lessee Disclosure [Text Block] Leases of Lessee Disclosure [Text Block] Public Utilities, Approved Return on Equity, Percentage Public Utilities, Approved Return on Equity, Percentage Schedule Of Finite-Lived Intangible Assets Amortization Expense Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Finance Lease, Principal Payments Finance Lease, Principal Payments Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Schedule of Income Taxes Allocated to Other Comprehensive Income (Loss) Components Schedule Of Other Comprehensive Income Loss Tax [Table Text Block] Schedule Of Other Comprehensive Income Loss Tax Net unrealized losses (gains) on equity investments Debt and Equity Securities, Unrealized Gain (Loss) Exelon Consolidation Exelon Consolidation [Member] Exelon Consolidation Included in regulatory assets/liabilities Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Regulatory assets Loss Contingencies [Table] Loss Contingencies [Table] Current Current Income Tax Expense (Benefit) Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) Annual average accretion of the ARO Asset Retirement Obligation Accretion Rate Asset Retirement Obligation Accretion Rate Energy efficiency and demand response programs RL Energy efficiency and demand response programs RL [Member] Energy efficiency and demand response programs RL Constant Maturity Treasury Interest Rate Swaps Through Report Date Constant Maturity Treasury Interest Rate Swaps Through Report Date [Member] Constant Maturity Treasury Interest Rate Swaps Through Report Date Regulatory Asset [Axis] Regulatory Asset [Axis] Receivables from and payables to affiliates, net Change in Receivables From Payables To Affiliates, Net The net change in related receivables and payables from entities that are affiliated with the reporting entity by means of direct or indirect ownership. A positive value indicates a decrease in the net receivable or an increase in the net payable, while a negative value indicates an increase in the net receivable or a decrease in the net payable. Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] Related Party Transactions - BSC and PHISCO Service Companies [Table Text Block] Related Party Transactions - BSC and PHISCO Service Companies [Table Text Block] Related Party Transactions - BSC and PHISCO Service Companies (Details) [Table Text Block] Exelon Transmission Company LLC [Member] Exelon Transmission Company LLC [Member] Derivative, Fair Value, Net Derivative, Fair Value, Net Equity investments without readily determinable fair values Equity Securities without Readily Determinable Fair Value, Amount Significant Accounting Policies Additional Narrative Information [Line Items] Significant Accounting Policies Additional Narrative Information [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Investments in affiliates Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures DELAWARE DELAWARE PNCTermLoanJuly2023 PNCTermLoanJuly2023 [Member] PNCTermLoanJuly2023 DISTRICT OF COLUMBIA DISTRICT OF COLUMBIA Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] Open Claims [Member] Open Claims [Member] Open Claims Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Depreciation and Amortization Cost, Depreciation and Amortization Nuclear fuel - work in progress Nuclear Fuel Fabrication And Installation Stage Nuclear Fuel that is in fabrication and installation stage. Deferred income taxes Deferred Income Tax Liabilities, Net Hedging Relationship [Axis] Hedging Relationship [Axis] Asset Retirement Obligation ARO beginning balance ARO ending balance Asset Retirement Obligation Penalty [Domain] Penalty [Domain] Penalty [Domain] Derivative Liability Total mark-to-market derivative liabilities Derivative Liability Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Purchases, sales, issuances and settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] Unamortized investment tax credits Accumulated Deferred Investment Tax Credit 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year One Notes Payable, Current Notes Payable, Current Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Income Tax Credits and Adjustments Income Tax Credits and Adjustments Preferred Stock [Member] Preferred Stock [Member] Senior unsecured notes [Member] Senior Notes [Member] Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Abstract] Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Abstract] Charged to Other Accounts SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Other Commitment Other Commitment Cash, restricted cash, and cash equivalents at beginning of period Cash, restricted cash, and cash equivalents at end of period Total cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Current liabilities Liabilities, Current [Abstract] Percentage to be settled as cash if ownership requirements are met Share-based Compensation by Share-based Payment Award, Percentage of Awards to be Settled in Cash if Agreement Conditions are Met Share-based Compensation by Share-based Payment Award, Percentage of Awards to be Settled in Cash if Agreement Conditions are Met PECO Trust IV Affiliate [Member] PECO Trust Four Affiliate [Member] PECO Trust IV Related Party Affiliate Potomac Electric Power Company [Member] Potomac Electric Power Company [Member] Potomac Electric Power Company [Member] Public Utilities General Disclosures [Table] Public Utilities General Disclosures [Table] Cash Equivalents [Member] Cash Equivalents [Member] Delaware 2022 Natural Gas Distribution Base Rate Case Delaware 2022 Natural Gas Distribution Base Rate Case [Member] Delaware 2022 Natural Gas Distribution Base Rate Case Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual Allowance for Credit Losses on Accounts Receivables (All Registrants) Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts [Policy Text Block] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Income Statement Location [Domain] Income Statement Location [Domain] Amendment Flag Amendment Flag Operating Lease, Cost Operating Lease, Cost Forward Power Basis Forward Power Basis Basis adjustment to the forward power price to deliver at an illiquid location. 2023 2023 [Member] Period increase or decrease goes into effect 2023 SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] No-Par Preferred Stock [Member] No-Par Preferred Stock [Member] Preferred stock authorized with no-par value. Cash Collections received on Deferred Purchase Price Cash Flows Between Transferor and Transferee, Beneficial Interest FMB530Feb2053 FMB530Feb2053 [Member] FMB530Feb2053 Construction work in progress Construction in Progress [Member] OtherNonFinancialCommitment1 OtherNonFinancialCommitment1 OtherNonFinancialCommitment1 Changes In Plan Assets And Benefit Obligations Recognized In OCI And Regulatory Assets Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Incremental collateral for loss of investment grade credit rating Incremental Collateral For Loss Of Investment Grade Credit Rating Incremental collateral amount required to be provided related to its financial instruments, including derivatives, non-derivatives, normal purchase normal sales contracts and applicable payables and receivables, if the credit rating is downgraded below investment grade. Exercisable at December 31, 2022 Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Nuclear insurance liability limit per incident Nuclear Insurance Annual Coverage Limit Annual coverage limit provided by the nuclear insurance arrangement for nuclear incident claims. Depreciation and amortization Depreciation, Depletion and Amortization Estimated targeted annual pre-tax return on nuclear decommissioning funds Assumed Returns on NDT Funds Assumed Returns on NDT Funds Schedule of Related Party Transactions [Table Text Block] Schedule of Related Party Transactions [Table Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Basis points for ComEd's Revenue Requirement Basis points for ComEd's Revenue Requirement Maximum basis points that can be added to the average rate on 30-year treasury notes, to determine the allowed ROE for ComEd's revenue requirement. Pennsylvania 2022 Natural Gas Distribution Base Rate Case Pennsylvania 2022 Natural Gas Distribution Base Rate Case [Member] Pennsylvania 2022 Natural Gas Distribution Base Rate Case Other Equity Method Investments Other Equity Method Investments [Member] Other Equity Method Investments [Member] Regulatory Matters Pending Rate Cases [Line Items] Regulatory Matters Pending Rate Cases [Line Items] Line Items for Regulatory Matters Pending Rate Cases [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Schedule of Interest Rate Derivatives Schedule of Interest Rate Derivatives [Table Text Block] Commercial Commitments Other Commitments [Table Text Block] Operating cash flows from operating leases Operating Lease, Payments Defined Benefit Plan Fair Value Of Plan Assets Defined Benefit Plan Fair Value Of Plan Assets [Table Text Block] This element may be used to capture assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those nonbenefit obligations may be considered as reductions of plan assets. Other Additional Capital [Member] Other Additional Capital [Member] Increase (Decrease) in ARO Due to Reversal of Early Retirement Increase (Decrease) in ARO Due to Reversal of Early Retirement Increase (Decrease) in ARO Due to Reversal of Early Retirement Common Stock, Shares Authorized Common Stock, Shares Authorized Unclassified Preference Stock [Member] Unclassified Preference Stock [Member] Unclassified Preference Stock [Member] Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Current year prior service cost (credit) Defined Benefit Plan Accumulated Other Comprehensive Income And Regulatory Assets Net Prior Service Cost Credit Before Tax Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. Disposal Group, Including Discontinued Operation, Interest Expense Disposal Group, Including Discontinued Operation, Interest Expense Schedule I - Condensed Financial Information of Parent (Exelon Corporate) Condensed Financial Information of Parent Company Only Disclosure [Text Block] Cash Equivalents NDT [Member] Cash Equivalents NDT [Member] Cash Equivalents NDT [Member] Nuclear Fuel [Member] Nuclear Fuel [Member] Restricted cash included in other long-term assets Restricted Cash and Cash Equivalents, Noncurrent Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Asset Retirement Obligations (All Registrants) Asset Retirement Obligation Disclosure [Text Block] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Changes in equity of noncontrolling interests Noncontrolling Interest, Period Increase (Decrease) Common Stock Warrants [Table Text Block] Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] NEW JERSEY NEW JERSEY Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Line of Credit Facility [Table] Line of Credit Facility [Table] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Lease Arrangement, Type [Axis] Lease Arrangements, Type [Axis] Lease Arrangements, Type Cash Flow Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Other Affiliate [Member] Other Affiliate [Member] Other Related Party Affiliate Share-based Payment Arrangement, Expense, Tax Benefit Tax benefit on stock compensation Share-Based Payment Arrangement, Expense, Tax Benefit Regulatory Asset, Current [Domain] Regulatory Asset, Current [Domain] Regulatory Asset, Current [Domain] Arithmetic Average [Member] Arithmetic Average [Member] Short-term borrowings Short-term Debt Short-Term Debt Long-term debt, deferred credits, and other liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent Unsecured tax-exempt bonds [Member] Bonds [Member] Total transaction costs relating to the Separation Total transaction costs relating to the Separation Total transaction costs relating to the Separation Offsets Offsets [Member] Offsets Schedule of Unrecognized Tax Benefits Roll Forward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Under-Recovered Credit Loss Expense Under-Recovered Credit Loss Expense [Member] Under-Recovered Credit Loss Expense Mark-to-market derivative assets, noncurrent Derivative Asset, Noncurrent Derivative Asset, Noncurrent MARYLAND MARYLAND Nonnuclear Decommissioning Asset Retirement Obligation [Member] Nonnuclear Decommissioning Asset Retirement Obligation [Member] Contributions from parent Adjustments to Additional Paid in Capital, Other Estimate of Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Deferred Prosecution Payment Litigation Settlement, Amount Awarded to Other Party ShortTermDebt03312021.1 [Member] ShortTermDebt03312021.1 [Member] ShortTermDebt03312021.1 Option to terminate within, Lessee, Operating Lease Lessee, Operating Lease, Option to Terminate Public Utilities, Approved Rate Increase (Decrease), Offsets [Axis] Public Utilities, Approved Rate Increase (Decrease), Offsets [Axis] Public Utilities, Approved Rate Increase (Decrease), Offsets Disposal Group, Including Discontinued Operation, Other Liabilities, Current Disposal Group, Including Discontinued Operation, Other Liabilities, Current Inventories, net Inventory, Net Accounts payable Accounts Payable, Current Fair value of PHI's unamortized energy contracts Fair Value Of Supply Contract [Member] Adjustment to fair value supply contracts; treated as deferred charges Income Tax Authority [Axis] Income Tax Authority [Axis] Contributions from parent Proceeds from Contributions from Parent Proceeds from Issuance of Common Stock Proceeds from Issuance of Common Stock Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] 2020 2020 [Member] 2020 Electric Distribution Formula Rate Annual Reconciliations [Member] Electric Distribution Formula Rate Annual Reconciliations [Member] Electric Distribution Formula Rate Annual Reconciliations [Member] Gain (Loss) on Disposition of Assets Gain (Loss) on Disposition of Assets Interest expense to affiliates Interest Expense, Related Party Proceeds from (Repayments of) Debt Proceeds from (Repayments of) Debt Annual depreciation rate Property Plant And Equipment Depreciation As Percent Of Average Service Life Rate Annual depreciation provision as a percentage of average service life for property, plant and equipment service category. Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] 2022 Transmission Formula Rate Revenue Reduction 2022 Transmission Formula Rate Revenue Reduction [Member] 2022 Transmission Formula Rate Revenue Reduction Nonrecourse [Member] Nonrecourse [Member] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Leases (All Registrants) Lessee, Leases [Policy Text Block] Stock-Based Compensation Plans Share-Based Payment Arrangement [Text Block] Share-based Payment Arrangement, Cost by Plan [Table Text Block] Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Illinois 2021 Electric Distribution Base Rate Case Illinois 2021 Electric Distribution Base Rate Case [Member] Illinois 2021 Electric Distribution Base Rate Case [Member] Estimated Future Claims [Member] Estimated Future Claims [Member] Estimated Future Claims Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] Actuarial loss reclassified to periodic cost Actuarial loss reclassified to periodic cost Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax 2024 Lessor, Operating Lease, Payment to be Received, Year Two Purchased power and/or fuel Cost, Direct Material PENNSYLVANIA PENNSYLVANIA Related Party [Axis] Related Party [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Undistributed Vested Awards, Weighted Average Grant Date Fair Value (in usd per share) Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Vested in Period, Undistributed Weighted Average Exercise Price Represents the weighted average exercise price of equity instruments other than options that vested but were not distributed to retirement eligible employees. Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Current Fiscal Year End Date Current Fiscal Year End Date Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Public Utilities, Approved Equity Capital Structure, Percentage Public Utilities, Approved Equity Capital Structure, Percentage Impairment or Disposal of Tangible Assets Disclosure [Abstract] Impairment or Disposal of Tangible Assets Disclosure [Abstract] Derivatives and other financial instruments Deferred Tax Liabilities, Derivatives Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation, Noncurrent Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation, Noncurrent Renewable energy credits, current Renewable Energy Credits, Current Renewable Energy Credits, Current Tax loss carryforward, net of valuation allowances Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Discontinued Operations (Exelon) Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate PECO Financing Trusts [Member] PECO Financing Trusts [Member] PECO Financing Trusts [Member] Subsegments Consolidation Items [Domain] Subsegments Consolidation Items [Domain] Bargain purchase gain Bargain purchase gain Business Combination, Bargain Purchase, Gain Recognized, Amount Schedule of Revenue by Major Customers by Reporting Segments Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Deferred debits and other assets Other Assets, Noncurrent [Abstract] Transfer of cash, restricted cash, and cash equivalents to Constellation Transfer of cash, restricted cash, and cash equivalents to Constellation Transfer of cash, restricted cash, and cash equivalents to Constellation Finance Lease, Weighted Average Remaining Lease Term Finance Lease, Weighted Average Remaining Lease Term VIRGINIA VIRGINIA Line of credit facility, remaining borrowing capacity Actual available capacity Line of Credit Facility, Remaining Borrowing Capacity Equity Security Individually Held [Member] Equity Security Individually Held [Member] Equity Security Individually Held [Member] Unrealized gain (loss) on investments in unconsolidated affiliates Other Comprehensive Income Unrealized Income Loss On Equity Investments Arising During Period Net Of Tax Change in accumulated income and losses from certain equity investments during the period being reported on, net of tax. Economic Hedges [Member] Economic Hedges [Member] Economic Hedges [Member] Defined Contribution Plan, Employer Discretionary Contribution Amount Savings plan matching contributions Defined Contribution Plan, Employer Discretionary Contribution Amount Subsequent Event [Table] Subsequent Event [Table] Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Other accounts receivable, net Other accounts receivable, net Other Receivables, Net, Current Entity Tax Identification Number Entity Tax Identification Number Shares authorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Schedule of weighted average grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] Ownership interest Jointly Owned Utility Plant, Proportionate Ownership Share Spent Nuclear Fuel Obligation [Table] Spent Nuclear Fuel Obligation [Table] Spent Nuclear Fuel Obligation [Table] Mutual Property Insurance Distribution To Members Mutual Property Insurance Distribution To Members Distribution by a nuclear industry mutual insurance company to its members. This distribution represents excess funds as a result of positive operating experience. Potomac Capital Investment Affiliate [Member] Potomac Capital Investment Affiliate [Member] Potomac Capital Investment Affiliate [Member] InterestRateCapNotional6month InterestRateCapNotional6month [Member] InterestRateCapNotional6month Capitalized Interest And AFUDC [Table] Capitalized Interest And AFUDC [Table] This table provides information about capitalized interest and AFUDC. Guarantee obligations maximum exposure Guarantor Obligations, Maximum Exposure, Undiscounted Other Other Regulatory Assets (Liabilities) [Member] Illinois 2023 Electric Distribution Base Rate Case Illinois 2023 Electric Distribution Base Rate Case [Member] Illinois 2023 Electric Distribution Base Rate Case Regulatory Matters Additional Narrative Information [Line Items] Regulatory Matters Additional Narrative Information [Line Items] Regulatory Matters Additional Narrative Information [Line Items] Severance Restructuring and Related Costs [Table Text Block] Statutory Accounting Practices, Jurisdiction [Domain] Statutory Accounting Practices, Jurisdiction [Domain] Schedule of Components of Lease Cost [Line Items] Schedule of Components of Lease Cost [Line Items] [Line Items] for Schedule of Components of Lease Cost Schedule of Lessee, Operating Lease, Liability, Maturity [Table] Schedule of Lessee, Operating Lease, Liability, Maturity [Table] Schedule of Lessee, Operating Lease, Liability, Maturity Additional Equity Securities Offering Additional Equity Securities Offering [Member] Additional Equity Securities Offering Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] PECO Energy Co Affiliate [Member] PECO Energy Co Affiliate [Member] Peco Energy Co Related Party Affiliate Other Non-Cash [Domain] Other Non-Cash [Domain] Other Non-Cash City Area Code City Area Code Other assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Supplemental Statement of Operations Information [Table] Supplemental Statement of Operations Information [Table] Schedule disclosing additional information about a registrants statement of operations. Financial Instruments Sold, Not yet Purchased, Corporate Debt Financial Instruments Sold, Not yet Purchased, Corporate Debt Notes Payable to Banks Notes Payable to Banks [Member] Recognition of Unrecognized Tax Benefits [Line Items] Recognition of Unrecognized Tax Benefits [Line Items] [Line Items] for Recognition of Unrecognized Tax Benefits [Table] Unfunded status (net benefit obligation less plan assets) Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Total liabilities Financial Liabilities Fair Value Disclosure Equity in earnings of unconsolidated affiliates Income (Loss) from Equity Method Investments Interest Rate Contract Interest Rate Contract [Member] Capital expenditures Payments to Acquire Property, Plant, and Equipment Capital expenditures Payments to Acquire Property, Plant, and Equipment Net benefit obligation as of the beginning of year Net benefit obligation as of the end of year Defined Benefit Plan, Benefit Obligation Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Illinois 2022 Electric Distribution Base Rate Case Illinois 2022 Electric Distribution Base Rate Case [Member] Illinois 2022 Electric Distribution Base Rate Case Other Postretirement Benefit Plan, Defined Benefit [Member] Other Postretirement Benefits Plan [Member] Other Postretirement Benefits Plan [Member] Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Entity Address, Postal Zip Code Entity Address, Postal Zip Code Potomac Electric Power Co Affiliate [Member] Potomac Electric Power Co Affiliate [Member] Potomac Electric Power Co Affiliate [Member] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Schedule of line of credit, short term, and long term debt [Table] Schedule of line of credit, short term, and long term debt [Table] Schedule of line of credit, short term, and long term debt ShortTermDebtSOFRplus075Oct2023 ShortTermDebtSOFRplus075Oct2023 [Member] ShortTermDebtSOFRplus075Oct2023 Line of Credit Facility, Maximum Borrowing Capacity Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Long-term debt due within one year Long-term Debt and Lease Obligation, Current Long-Term Debt and Lease Obligation, Current Regulatory Matters Completed Rate Cases [Table] Regulatory Matters Completed Rate Cases [Table] Regulatory Matters Completed Rate Cases [Table] Deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Restructuring Reserve Restructuring Reserve Number Of Years Used In Present Value Measurement Number Of Years Used In Present Value Measurement Number of years that measurement of the obligation at the present value of the future estimated costs and an annual average accretion of the ARO occurs. Unrealized (loss) gain on foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Actual Asset Returns us-gaap_DefinedBenefitPlanActualAssetReturns Actual Asset Returns Advanced Metering Infrastructure Legacy Meter Costs [Member] Advanced Metering Infrastructure Legacy Meter Costs [Member] Legacy AMI [Member] Disposal Group, Including Discontinued Operation, Postretirement Plan Benefit Obligation, Noncurrent Disposal Group, Including Discontinued Operation, Postretirement Plan Benefit Obligation, Noncurrent Proceeds from Issuance or Sale of Equity Proceeds from Issuance or Sale of Equity Other Fixed Income [Member] Other Fixed Income [Member] Other Fixed Income [Member] Long-term Contract for Purchase of Electric Power [Member] Long-term Contract for Purchase of Electric Power [Member] Long-term Contract for Purchase of Electric Power Asset Pledged as Collateral [Member] Asset Pledged as Collateral [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] 2022 2022 [Member] 2022 Historical five-year annual average after-tax return on NDT funds Return on Nuclear Decommissioning Funds, Historical Historical annual average after-tax return on NDT funds Public Utilities, Approved Rate Increase (Decrease), Amount Public Utilities, Approved Rate Increase (Decrease), Amount Public Utilities, Approved Rate Increase (Decrease), Amount Amortization of Power Contracts Emission Credits Amortization of Power Contracts Emission Credits Supplemental Cash Flow Information [Table] Supplemental Cash Flow Information [Table] Schedule disclosing additional information about a registrants statement of cash flows Options to extend the term, Lessee, Operating Lease Lessee, Operating Lease, Option to Extend Pension And Other Postretirement Benefit Contributions Pension And Other Postretirement Benefit Contributions [Table Text Block] This element may be used to capture the amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans. Non-service net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Approved Capital Expenditure IIP 2.0 Approved Capital Expenditure IIP 2.0 Approved Capital Expenditure IIP 2.0 Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] Guarantees (All Registrants) Guarantees, Indemnifications and Warranties Policies [Policy Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Net income (loss) attributable to membership interest Net Income (Loss) Attributable to Parent Other Intangible Assets [Member] Other Intangible Assets [Member] Prior service cost (credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Increase in Deferred Purchase Price Supplemental Deferred Purchase Price Regulatory liabilities 2022 [Member] Regulatory Liabilities 2021 [Member] Regulatory Liabilities 2021 Private Credit [Member] Private Credit [Member] Private Credit [Member] Customer accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Asset Retirement Obligation, Revision of Estimate Asset Retirement Obligation, Revision of Estimate Schedule of Regulatory Assets Schedule of Regulatory Assets [Table Text Block] Assets, Fair Value Disclosure Assets, Fair Value Disclosure Asset Retirement Obligation Roll Forward Analysis [Line Items] Asset Retirement Obligation Roll Forward Analysis [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Selected Quarterly Financial Information [Line Items] Selected Quarterly Financial Information [Line Items] Selected Quarterly Financial Information [Line Items] Title of 12(g) Security Title of 12(g) Security Derivative Instrument [Axis] Derivative Instrument [Axis] Regulated Operations [Abstract] Regulated Operations [Abstract] Goodwill [Line Items] Goodwill [Line Items] Commodity Derivative Assets [Member] Commodity Derivative Assets [Member] Commodity Derivative Assets [Member] Cash Collections Reinvested in the Facility Cash Flows Between Transferor and Transferee, Proceeds from Collections Reinvested in Revolving Period Transfers Net cash flows provided by operating activities Net Cash Provided by (Used in) Operating Activities Derivative Asset Derivative Asset Other non-cash operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Penalty [Axis] Penalty [Axis] Penalty USBTermLoanJuly2023 USBTermLoanJuly2023 [Member] USBTermLoanJuly2023 Spent Nuclear Fuel Treasury Interest Rate - FitzPatrick Spent Nuclear Fuel Treasury Interest Rate - FitzPatrick Interest rate used to calculated interest accrued on one-time fee applicable to nuclear generation through April 6, 1983 under the standard contracts with the Department of Energy which was elected to be deferred with interest until just prior to the first delivery of spent nuclear fuel to the Department of Energy. The interest rate used is the 13-week Treasury Rate. Other Regulated Revenue [Member] Other Regulated Revenue [Member] Other Regulated Revenue [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Liability Class [Axis] Liability Class [Axis] Schedule Of Capitalized Interest And AFUDC Schedule Of Capitalized Interest And AFUDC [Table Text Block] This element is used to capture total interest costs incurred, capitalized interest and credits of AFUDC by year. Regulatory assets 2022 [Member] Regulatory assets 2022 [Member] Regulatory assets 2022 Sale of Accounts Receivable [Member] Sale of Accounts Receivable [Member] Sale of Accounts Receivable Contributions from member Proceeds from Contributions from Affiliates Other Legal Entities [Member] Other Legal Entities [Member] Other Legal Entities [Member] Pension obligations Liability, Defined Benefit Plan, Noncurrent Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits Commonwealth Edison Co Affiliate [Member] Commonwealth Edison Co Affiliate [Member] Commonwealth Edison Co Affiliate. Equity Securities Offering [Domain] Equity Securities Offering [Domain] Equity Securities Offering [Domain] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Accounts Receivable, Sale Accounts Receivable, Sale Interest expense, net Interest Revenue (Expense), Net Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the other postretirement benefit plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. Lessee, finance lease, discount rate Lessee, Finance Lease, Discount Rate Remaining lease terms, Lessee, Operating Lease Lessee, Operating and Finance Leases, Terms of Contracts Lessee, Operating and Finance Leases, Terms of Contracts Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Restructuring Type [Axis] Restructuring Type [Axis] Segments [Axis] Segments [Axis] Debt and Credit Agreements (All Registrants) Debt Disclosure [Text Block] Discontinued Operations - Income Statement Discontinued Operations - Income Statement [Table Text Block] Discontinued Operations - Income Statement Reduction of restricted cash from deconsolidation of business Cash Divested from Deconsolidation Equity Securities Offering [Axis] Equity Securities Offering [Axis] Equity Securities Offering Long-term Purchase Commitment, Minimum Energy Volume Required Long-Term Purchase Commitment, Minimum Energy Volume Required 2023 Lessee, Operating Lease, Liability, to be Paid, Year One 2025 Long-Term Debt, Maturity, Year Three Vehicles [Member] Vehicles [Member] Affiliated Entities [Member] Affiliated Entity [Member] Total transaction costs taxes relating to the Separation Total transaction costs taxes relating to the Separation Total transaction costs taxes relating to the Separation Other Commitment, to be Paid, Year Five Other Commitment, to be Paid, Year Five Tax Effects of Temporary Differences Summary of Deferred Tax Liability Not Recognized [Table Text Block] Schedule Of Changes In Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Total assets Total assets Assets Earnings per average common share from discontinued operations Earnings Per Share [Abstract] Actuarial loss (gain) Defined Benefit Plan Accumulated Other Comprehensive Income And Regulatory Assets Gains Losses Before Tax The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. Margin Deposit Assets Margin Deposit Assets Interest Rate Swap [Member] Interest Rate Swap [Member] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Public Utilities, Requested Return on Equity, Percentage Public Utilities, Requested Return on Equity, Percentage Investments Total Investments Long-Term Investments Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Segments [Domain] Segments [Domain] Deferred income taxes and amortization of investment tax credits Deferred Income Taxes and Tax Credits Deferred Income Taxes and Tax Credits Lessor, Lease, Description [Line Items] Lessor, Lease, Description [Line Items] Interest Rate Derivative Liabilities [Domain] Interest Rate Derivative Liabilities [Domain] Interest Rate Derivative Liabilities InterestRateCap18month InterestRateCap18month [Member] InterestRateCap18month Other, net Deferred Tax Liabilities, Other Regulatory Asset [Domain] Regulatory Asset [Domain] Schedule of Commercial Paper Borrowings Schedule of Short-Term Debt [Table Text Block] Goodwill, Gross Goodwill, Gross Cash and Cash Equivalents (All Registrants) Cash and Cash Equivalents, Policy [Policy Text Block] Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Increase (Decrease) in ARO for Impacts of Revised Decommissioning Cost Estimates Increase (Decrease) in ARO for Impacts of Revised Decommissioning Cost Estimates Increase (Decrease) in ARO for Impacts of Revised Decommissioning Cost Estimates Increase (Decrease) in Income Taxes Increase (Decrease) in Income Taxes Income Taxes Receivable, Current Income Taxes Receivable, Current Revenue from Contract with Customer, Including Assessed Tax Revenue from Contract with Customer, Including Assessed Tax Revenue from Contract with Customer, Including Assessed Tax Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Schedule of Operating Lease, Lease Income [Table] Schedule of Operating Lease, Lease Income [Table] Schedule of Operating Lease, Lease Income Components Residential [Member] Residential [Member] Residential [Member] Foreign Currency Items Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Customer Relationships [Member] Customer Relationships [Member] Entity Address, City or Town Entity Address, City or Town PEPCO Holdings Inc [Member] PEPCO Holdings Inc [Member] PEPCO Holdings Inc [Member] Regulatory Liabilities Regulatory Liability Operating Expenses [Abstract] Operating Expenses [Abstract] Spent Nuclear Fuel Obligation [Line Items] Spent Nuclear Fuel Obligation [Line Items] [Line Items] for Spent Nuclear Fuel Obligation [Table] Nuclear Decommissioning Byron Nuclear Decommissioning Byron [Member] Nuclear Decommissioning Byron Intersegment Eliminations [Member] Intersegment Eliminations [Member] Proceeds from Sale and Collection of Notes Receivable Proceeds from Sale and Collection of Notes Receivable Goodwill Impairment Loss Goodwill, Impairment Loss, Net of Tax Total equity Beginning Balance Ending Balance Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Restricted cash and cash equivalents Restricted cash Restricted Cash and Cash Equivalents, Current Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items] Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items] [Line Items] for Schedule of Lessee, Operating Lease, Liability, Maturity Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount Amount of public utility's requested rate increase (decrease) with regulatory agency, initial revenue requirement. Defined benefit plan, amounts increased (decrease) in regulatory liabilities, before tax Defined Benefit Plan Amounts Recognized In Regulatory Liabilities Before Tax Increase in regulatory liabilities due to updated valuation received by Exelon for its legacy pension and other postretirement benefit obligations. Asset retirement obligations, noncurrent Asset Retirement Obligations, Noncurrent Net fair value changes related to derivatives Unrealized Gain (Loss) on Derivatives Unrealized Gain (Loss) on Derivatives Accounting Standards Update [Axis] Accounting Standards Update [Axis] Public Utilities, Requested Rate Increase (Decrease), Amount Public Utilities, Requested Rate Increase (Decrease), Amount Share Price Share Price State net operating loss carryforwards Operating Loss Carryforwards Real Estate [Member] Real Estate [Member] Fair Value Measured at Net Asset Value Per Share [Member] Fair Value Measured at Net Asset Value Per Share [Member] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Relating to assets still held at the reporting date Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Pennsylvania 2021 Electric Distribution Base Rate Case [Member] Pennsylvania 2021 Electric Distribution Base Rate Case [Member] Pennsylvania 2021 Electric Distribution Base Rate Case Accounting Standards Update 2016-01 [Member] Accounting Standards Update 2016-01 [Member] Total operating revenues Revenues Revenues Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Regulatory Matters Completed Rate Cases [Line Items] Regulatory Matters Completed Rate Cases [Line Items] [Line Items] for Regulatory Matters Completed Rate Cases [Table] Public Utilities, Approved Rate Increase (Decrease), Tax Benefits [Domain] Public Utilities, Approved Rate Increase (Decrease), Tax Benefits [Domain] Public Utilities, Approved Rate Increase (Decrease), Tax Benefits [Domain] Regulatory assets, current Current regulatory assets Regulatory Asset, Current PHI Merger Commitments [Line Items] PHI Merger Commitments [Line Items] [Line Items] for PHI Merger Commitments [Table] Intangible asset amortization expense Amortization of Intangible Assets Amortization of Intangible Assets Regulated Operations - Capitalized Ratemaking Amounts Not Recognized [Abstract] Regulated Operations - Capitalized Ratemaking Amounts Not Recognized [Abstract] Regulated Operations - Capitalized Ratemaking Amounts Not Recognized [Abstract] Interest (net of amount capitalized) Interest Paid, Excluding Capitalized Interest, Operating Activities Long-Term Marginal State Income Tax Rate [Line Items] Long-Term Marginal State Income Tax Rate [Line Items] [Line Items] for Long-Term Marginal State Income Tax Rate [Table] Service, Other [Member] Service, Other [Member] 2025 Lessee, Operating Lease, Liability, to be Paid, Year Three Pre-commencement Tender Offer Pre-commencement Tender Offer Other assets Other Assets [Member] Pension and Non-Pension Postretirement Benefit Plan Items (a) Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] ShortTermDebt01242022 ShortTermDebt01242022 [Member] ShortTermDebt01242022 Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation LDC Damages - Accrued Liability LDC Damages - Accrued Liability [Member] LDC Damages - Accrued Liability Total shareholders’ equity Beginning Balance Ending Balance Total shareholders’ equity Stockholders' Equity Attributable to Parent Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Derivative Financial Instruments (All Registrants) Derivative Instruments and Hedging Activities Disclosure [Text Block] Federal general business credits carryforwards(a) Tax Credit Carryforward, Amount Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Forfeited, Weighted Average Exercise Price (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Borrowings from Exelon/PHI intercompany money pool Due to Affiliate, Current Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Three Retained Earnings [Member] Retained Earnings [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Total Lease Cost Lease, Cost Common Stock [Member] Common Stock [Member] Components of Lease Cost [Table Text Block] Lease, Cost [Table Text Block] To support additional commercial paper Line of Credit Facility, Capacity Available for Trade Purchases Regulatory Liability [Domain] Regulatory Liability [Domain] Schedule of Nonvested Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Income Tax Additional Narrative Information [Table] Income Tax Additional Narrative Information [Table] Income Tax Additional Disclosure [Table] Vested, Weighted Average Exercise Price (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Schedule of Nonvested Performance-based Units Activity Schedule of Nonvested Performance-Based Units Activity [Table Text Block] Schedule of Supplemental Cash Flow Information Related to Leases [Table Text Block] Schedule of Supplemental Cash Flow Information Related to Leases [Table Text Block] Schedule of Supplemental Cash Flow Information Related to Leases Schedule of Lessor, Operating Lease, Payments to be Received, Maturity [Table] Schedule of Lessor, Operating Lease, Payments to be Received, Maturity [Table] Schedule of Lessor, Operating Lease, Payments to be Received, Maturity Disposal Group Name [Axis] Disposal Group Name [Axis] Maximum annual assessment payment mandated by Price-Anderson Act for a nuclear incident Nuclear Insurance Financial Protection Pool Maximum Annual Assessment Payment Maximum annual payment of the assessment per nuclear reactor for a nuclear incident, under the financial protection pool mandated by the Price-Anderson Act. This payment is made by each United States nuclear reactor operator over multiple years in the event of an incident at any United States nuclear reactor, until the total assessment has been fully paid. Customer accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Cost incurred related to decommissioning plants Payments Asset Retirement Obligation, Cash Paid to Settle US Treasury and Government [Member] US Treasury and Government [Member] Equity Components [Axis] Equity Components [Axis] Schedule of Amounts Recognized in Balance Sheet Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Accumulated depreciation Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation Illinois Power Agency Illinois Power Agency [Member] Illinois Power Agency Mark-to-Market Derivative Liabilities [Domain] Mark-to-Market Derivative Liabilities [Domain] Mark-to-Market Derivative Liabilities Cap on Equity Component of Rate of Return on Common Equity in Federal Energy Regulatory Committee Complaint Cap on Equity Component of Rate of Return on Common Equity in Federal Energy Regulatory Committee Complaint The maximum percentage allowed for the equity component of the rate of return on common equity in the Federal Energy Regulatory Committee Complaint. Expected qualified pension plan contributions Qualified Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the qualified pension plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. Total deferred credits and other liabilities Total deferred credits and other liabilities Deferred Credits and Other Liabilities 2026 2026 [Member] 2026 Statement [Line Items] Statement [Line Items] Exelon INQB8R, LLC [Member] [Member] Exelon INQB8R, LLC [Member] [Member] Exelon INQB8R, LLC [Member] [Member] Options to extend the term, Lessor, Operating Lease Lessor, Operating Lease, Option to Extend Advanced Metering Infrastructure Deployment Costs [Member] Advanced Metering Infrastructure Deployment Costs [Member] Advanced Metering Infrastructure Deployment Costs [Member] Increase (Decrease) in ARO Due to Change in DOE Spent Fuel Acceptance Date Increase (Decrease) in ARO Due to Change in DOE Spent Fuel Acceptance Date Increase (Decrease) in ARO Due to Change in DOE Spent Fuel Acceptance Date Claim Types [Domain] Claim Types [Domain] Claim Types Capitalized Interest And AFUDC [Line Items] Capitalized Interest And AFUDC [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Components of Operating Lease Income [Table Text Block] Operating Lease, Lease Income [Table Text Block] Fair Value Of Settled Restricted Stock Units Fair Value Of Settled Restricted Stock Units Fair value of settled restricted stock Accumulated Other Comprehensive Income (Loss), net Total AOCI Attributable to Parent [Member] Basis points for Transmission Formula Rate Basis points for Transmission Formula Rate Basis points for Transmission Formula Rate Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Disclosure [Abstract] Exelon Generation Co L L C [Member] Exelon Generation Co L L C [Member] Exelon Generation Co LLC [Member] Auditor Firm ID Auditor Firm ID Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease Depreciation, Lessor Asset under Operating Lease 2027 2027 [Member] Period increase or decrease goes into effect 2027 Lessor, Operating Lease, Description Lessor, Operating Lease, Description Rate-Regulated Electric Revenues [Member] Rate-Regulated Electric Revenues [Member] Rate-Regulated Electric Revenues [Member] Net Interest Receivable Payable Related To Uncertain Tax Positions Net Interest Receivable Payable Related To Uncertain Tax Positions The amount of net interest receivable (payable) recognized for uncertain tax positions as of the balance sheet date. State and Local Jurisdiction [Member] State and Local Jurisdiction [Member] Schedule of Components of Lease Cost [Table] Schedule of Components of Lease Cost [Table] Schedule of Components of Lease Cost Adjustments to reconcile net income to net cash flows provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Benefit Obligation Investment Crediting Rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate Renewable Energy Program [Member] Renewable Energy Program [Member] 2026 Lessee, Operating Lease, Liability, to be Paid, Year Four Income Statement [Abstract] Income Statement [Abstract] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Credit Loss [Abstract] Licensing Agreements [Member] Licensing Agreements [Member] Aggregate value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Regulation Status [Axis] Regulation Status [Axis] Contract Type [Domain] Contract Type [Domain] Contract Type Diluted Average Number of Shares Outstanding Weighted Average Number of Shares Outstanding, Diluted Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Stock Based Compensation Tax Benefit Stock Based Compensation Tax Benefit [Table Text Block] Tax deduction based on the intrinsic value of the award on the exercise date for stock options and distribution date for performance share awards and restricted stock units. Schedule of Capitalization, Equity [Table] Schedule of Capitalization, Equity [Table] 2028 2028 [Member] 2028 Undistributed Earnings [Member] Undistributed Earnings [Member] Undistributed Earnings. Schedule of Jointly Owned Utility Plants Schedule of Jointly Owned Utility Plants [Table Text Block] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Receivable from affiliates, noncurrent Accounts Receivable, Related Parties, Noncurrent Baltimore Gas And Electric Company Affiliate [Member] Baltimore Gas And Electric Company Affiliate [Member] Baltimore Gas and Electric Related Party Affiliate Granted, Weighted Average Grant Date Fair Value (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Realized Investment Gains (Losses) Realized Investment Gains (Losses) Accounts Receivable, Related Parties, Purchase Accounts Receivable, Related Parties, Purchase Accounts Receivable, Related Parties, Purchase Assets and Liabilities Measured and Recorded at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Loan agreement [Member] Loans Payable [Member] Net income (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Commitments and Contingencies (All Registrants) Commitments and Contingencies Disclosure [Text Block] Atlantic City Electric Co Affiliate [Member] Atlantic City Electric Co Affiliate [Member] Atlantic City Electric Co Affiliate [Member] Accumulated Impairment Loss Goodwill, Impaired, Accumulated Impairment Loss Common Stock, Shares, Issued Common Stock, Shares, Issued VEBA [Member] VEBA [Member] VEBA [Member] Cash Flow Hedges Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Initial Equity Securities Offering Initial Equity Securities Offering [Member] Initial Equity Securities Offering Utility Utilities Operating Expense, Taxes Cash Flow Hedging Cash Flow Hedging [Member] Finance Lease, Liability, Current Finance Lease, Liability, Current Net cash flows used in investing activities Net Cash Provided by (Used in) Investing Activities Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Design Changes Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Design Changes The interest rate used to adjust for the time value of money for design changes. Internal Revenue Service (IRS) [Member] Internal Revenue Service (IRS) [Member] Payables to affiliates, current Accounts Payable, Related Parties, Current Accounts Payable, Related Parties, Current Corporate and Other [Member] Corporate and Other [Member] Regulatory Asset, Current [Axis] Regulatory Asset, Current [Axis] Regulatory Asset, Current Analysis and reconciliation of reportable segment information Schedule of Segment Reporting Information, by Segment [Table Text Block] Entity Current Reporting Status Entity Current Reporting Status Asset retirement obligations Asset Retirement Obligation Costs [Member] Related Party Transactions - Long Term Debt to Financing Trusts [Table Text Block] Related Party Transactions - Long Term Debt to Financing Trusts [Table Text Block] Related Party Transactions - Long Term Debt to Financing Trusts [Table Text Block] Contract Assets [Member] Contract Assets [Member] Contract Assets Purchased power and/or fuel from affiliates Related Party Transaction, Purchases from Related Party Related Party Transaction, Purchases from Related Party Changes in short-term borrowings Changes in short-term borrowings Proceeds from (Repayments of) Short-Term Debt, Maturing in Three Months or Less Energy Efficiency Costs [Member] Energy Efficiency Costs [Member] Energy Efficiency Costs [Member] Severance [Member] Employee Severance [Member] U.S. Federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Electric Transmission [Member] Electric Transmission [Member] Effective Income Tax Rate Reconciliation, Deferred Prosecution Agreement payments Effective Income Tax Rate Reconciliation, Deferred Prosecution Agreement payments Effective Income Tax Rate Reconciliation, Deferred Prosecution Agreement payments Project [Axis] Project [Axis] Employee stock purchase plan issuances, shares Stock Issued During Period, Shares, Employee Stock Purchase Plans Beginning Balance Ending Balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Derivative assets, fair value Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] ShortTermDebtSOFRplus075Jan2023 ShortTermDebtSOFRplus075Jan2023 [Member] ShortTermDebtSOFRplus075Jan2023 Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Estimated Litigation Liability, Current Estimated Litigation Liability, Current Non-pension postretirement benefit obligations Other Postretirement Defined Benefit Plans Liabilities Noncurrent This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the other postretirement defined benefit plans. State income taxes, net of Federal income tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Regulatory liabilities 2021 [Member] Regulatory liabilities 2020 [Member] Regulatory liabilities 2020 Significant Accounting Policies Additional Narrative Information [Table] Significant Accounting Policies Additional Narrative Information [Table] Significant Accounting Policies Additional Narrative Information [Table] Property, plant and equipment, net Property, Plant and Equipment, Net Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Property, plant, and equipment, net Public Utilities, Property, Plant and Equipment, Net Notes payable and other [Member] Notes Payable, Other Payables [Member] Deferred Tax Liabilities, Regulatory Assets and Liabilities Deferred Tax Liabilities, Regulatory Assets and Liabilities Long-term Debt Total Long-Term Debt Other, net Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Pension and Post Retirement Plan Merger Costs [Member] Pension and Post Retirement Plan Merger Costs [Member] Pension and Post Retirement Plan Merger Costs [Member] Long-Term Incentive Plan Activity (shares) Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Taxes accrued Taxes Payable, Current Income taxes (net of refunds) Income Taxes Paid, Net Business Disposition [Axis] Business Disposition [Axis] Business Disposition Contractual termination benefits Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Revenue Recognized Nuclear financial protection pool value Nuclear Insurance Financial Protection Pool Value Total funds available for nuclear insurance liability claims in a financial protection pool mandated by the Price-Anderson Act. Measurement Basis [Axis] Measurement Basis [Axis] Long-term debt to financing trusts Long-term debt to financing trusts Due to Affiliate, Noncurrent Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Unamortized energy contract liabilities, current Energy Marketing Contract Liabilities, Current First Mortgage First Mortgage [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period ComEd Financing III Affiliate [Member] ComEd Financing Three Affiliate [Member] ComEd Financing III Related Party Affiliate Stranded costs Stranded Costs [Member] Jointly Owned Electric Utility Plant (Exelon, PECO, DPL and ACE) Schedule Of Jointly Owned Electric Utility Plant [TextBlock] Describes that the entity has a proportionate interest in a jointly owned utility plant. Should include a table showing separately for each interest the amount of plant in service, the accumulated provision for depreciation (if available), the amount of plant under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Should include statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. Should state that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power then should disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Operating and maintenance Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses Total operating expenses Costs and Expenses Costs and Expenses Class of Warrant or Right [Table] Class of Warrant or Right [Table] ShortTermDebtSOFRplus075PLUS22.5BPincreaseJan2023 ShortTermDebtSOFRplus075PLUS22.5BPincreaseJan2023 [Member] ShortTermDebtSOFRplus075PLUS22.5BPincreaseJan2023 Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] State and Municipal Debt [Member] US Government Agencies Debt Securities [Member] Operating Lease, Liability Operating Lease, Liability Transmission formula rate annual reconciliations [Member] Under/Over Recovered Transmission Costs [Member] Under/Over Recovered Transmission Costs [Member] Balance at Beginning of Period Balance at End of Period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Remaining lease terms, Lessor, Operating Lease Lessor, Operating Lease, Term of Contract Lessor, Operating Lease, Term of Contract Finance Lease, Liability, to be Paid Finance Lease, Liability, to be Paid Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] Finance Lease, Liability, Fiscal Year Maturity Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Ultimate health care cost trend rate Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Interest income from affiliates, net Interest Income, Related Party Nuclear Decommissioning Trust Fund Investments [Member] Nuclear Decommissioning Trust Fund Investments [Member] This element represents the assets measured at fair value on a recurring basis related to nuclear decommissioning trust fund investments. Subsegments [Domain] Subsegments [Domain] Defined Benefit Plan, Plan Assets, Benefits Paid Defined Benefit Plan, Plan Assets, Benefits Paid West Lake [Member] West Lake [Member] West Lake [Member] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] 2026 Long-Term Debt, Maturity, Year Four Hedging Relationship [Domain] Hedging Relationship [Domain] Hedging Designation [Axis] Hedging Designation [Axis] Auditor Location Auditor Location Delmarva Power and Light Co Affiliate [Member] Delmarva Power and Light Co Affiliate [Member] Delmarva Power and Light Co Affiliate [Member] Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Commitments and contingencies Commitments and Contingencies Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations Weighted Average Exercise Price (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Quarterly Financial Information Quarterly Financial Information [Table Text Block] Purchases and Sales of Accounts Receivable Purchases and Sales of Accounts Receivable [Table Text Block] Purchases and Sales of Accounts Receivable Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax Nuclear decommissioning trust funds Decommissioning Fund Investments Decommissioning Fund Investments Disposal Group, Including Discontinued Operation, Operating Income (Loss) Disposal Group, Including Discontinued Operation, Operating Income (Loss) Renewable energy credit obligation Energy Marketing Accounts Payable Service cost Defined Benefit Plan, Service Cost Deferred Tax Valuation Allowance [Member] SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] Interest Costs Capitalized Interest Costs Capitalized Entity Voluntary Filers Entity Voluntary Filers General Business Tax Credit Carryforward [Member] General Business Tax Credit Carryforward [Member] Business Dispositions [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Percentage to be settled as cash Share-based Compensation by Share-based Payment Award, Percentage of Awards to be Settled in Cash Share-based Compensation by Share-based Payment Award, Percentage of Awards to be Settled in Cash Actuarial losses Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Schedule of Lessor, Operating Lease, Payments to be Received, Maturity [Line Items] Schedule of Lessor, Operating Lease, Payments to be Received, Maturity [Line Items] [Line Items] for Schedule of Lessor, Operating Lease, Payments to be Received, Maturity Finance Lease, Weighted Average Discount Rate, Percent Finance Lease, Weighted Average Discount Rate, Percent Revenue from Contracts with Customers [Text Block] Revenue from Contract with Customer [Text Block] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Forecast [Member] Forecast [Member] Contractual Obligation Contractual Obligation Connectiv, LLC Connectiv, LLC [Member] Connectiv, LLC [Member] Exelon Utility Registrants Affiliates [Member] Exelon Utility Registrants Affiliates [Member] Exelon Utility Registrants Affiliates Documents Incorporated by Reference [Text Block] Documents Incorporated by Reference [Text Block] Discount rate - Benefit Obligation Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Total liabilities and equity Total liabilities and equity Liabilities and Equity Accounts Receivable, Purchase Accounts Receivable, Purchase Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Accounts receivable Increase (Decrease) in Receivables Finance Lease, Cost Finance Lease, Cost Finance Lease, Cost Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Nine Mile Point [Member] Nine Mile Point [Member] Nine Mile Point [Member] Alternative Investments [Member] Alternative Investments [Member] Alternative investments include private equity, hedge funds and real estate. Performance Share Awards Obligations Settled In Cash Performance Share Awards Obligations Settled In Cash Obligations related to outstanding performance share awards that have been settled in cash. Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Renewable portfolio standards costs Renewable portfolio standards costs [Member] Renewable portfolio standards costs Gain (Loss) on Contract Termination Gain (Loss) on Contract Termination Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost [Table Text Block] This element may be used to capture the assumptions used to calculate net periodic benefit cost. Unrecognized Tax Benefits - Beginning Balance Unrecognized tax benefits - Ending Balance Unrecognized Tax Benefits Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] This element represents, for the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs). Other Commitments, Due in Next Twelve Months Other Commitment, to be Paid, Year One Equity Members Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Members' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Remaining years Lessor, Operating Lease, Payment to be Received, after Year Five Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Table Text Block] Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Table Text Block] Other [Member] Other [Member] Other [Member] Corporate Debt Securities [Member] Corporate Debt Securities [Member] Schedule Of Pension And Other Postretirement Benefit Costs Schedule Of Pension And Other Postretirement Benefit Costs [Table Text Block] This element may be used to capture the entire pension and other postretirement benefit expense table. Deferred credits and other liabilities Other Liabilities, Noncurrent [Abstract] Allowance for Credit Losses Rollforward Accounts Receivable, Allowance for Credit Loss [Table Text Block] Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Address, Address Line Two Entity Address, Address Line Two Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Entity Address, Address Line One Entity Address, Address Line One Other Comprehensive Income (Loss), Tax Other Comprehensive Income (Loss), Tax Product and Service [Axis] Product and Service [Axis] Hedge Funds [Member] Hedge Funds [Member] Expected return on assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Change in Enacted Tax Rate, Percent Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Trade Names [Member] Trade Names [Member] Employee benefit trusts and investments Employee Benefit Trusts and Investments [Member] Employee Benefit Trusts and Investments [Member] Pepco Energy Services Affiliate [Member] Pepco Energy Services Affiliate [Member] Pepco Energy Services Affiliate [Member] Deferred storm costs Deferred storm costs [Member] Deferred storm costs Other deferred debits and other assets [Member] Other Noncurrent Assets [Member] Other Noncurrent Assets [Member] Cash paid (refunded) during the year: Cash Paid (Refunded) During the Year [Abstract] Cash Paid (Refunded) During the Year Reclassification, Comparability Adjustment Reclassification, Comparability Adjustment [Policy Text Block] Repayments on short-term borrowings with maturities greater than 90 days Repayments of Short-Term Debt, Maturing in More than Three Months Deferred income tax liabilities (net) Deferred Tax Liabilities, Gross Depreciation, amortization and accretion Depreciation, Amortization and Accretion, Net [Abstract] SMBCTermLoanJuly2023 SMBCTermLoanJuly2023 [Member] SMBCTermLoanJuly2023 Asset Impairments Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Axis] Measurement Frequency [Axis] Measurement Frequency [Axis] SEC Schedule, 12-09, Allowance, Credit Loss [Member] SEC Schedule, 12-09, Allowance, Credit Loss [Member] Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock Repurchase Program, Number of Shares Authorized to be Repurchased Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] InterestRateSwap-Through Report Date InterestRateSwap-Through Report Date [Member] InterestRateSwap-Through Report Date Retained Earnings Appropriated [Member] Retained Earnings, Appropriated [Member] Property Plant And Equipment Average Service Life Percentage By Asset Category Table Property Plant And Equipment Average Service Life Percentage By Asset Category Table [Table Text Block] This table presents the annual depreciation provisions as a percentage of average service life for each asset category. Accrual for Environmental Loss Contingencies, Period Increase (Decrease) Accrual for Environmental Loss Contingencies, Period Increase (Decrease) Transfers into (out of) Level 3 Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Decommissioning the Regulatory Agreement Units Nuclear Decommissioning [Member] Represents estimated future nuclear decommissioning costs that exceed (regulatory asset) or are less than (regulatory liability) the associated decommissioning trust fund assets. Beginning Balance Ending Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Due to Related Parties, Current Due to Related Parties, Current Supplemental Financial Information [Abstract] Supplemental Financial Information [Abstract] Supplemental Financial Information [Abstract] Accrual For Environmental Loss Contingencies Material Components [Domain] Accrual For Environmental Loss Contingencies Material Components [Domain] Accrual For Environmental Loss Contingencies Material Components [Domain] Interest Finance Lease, Liability, Undiscounted Excess Amount Amortization of actuarial loss Defined Benefit Plan Amortization Of Net Gains Losses In Oci And Regulatory Assets The amounts in accumulated other comprehensive income and regulatory assets related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented. Other Additional Capital Other Additional Capital Prior service cost (credit) Defined Benefit Plan Accumulated Other Comprehensive Income And Regulatory Assets Prior Service Cost Credit Before Tax Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. Business Acquisition [Axis] Business Acquisition [Axis] Regulated and Unregulated Operation [Domain] Regulated and Unregulated Operation [Domain] Deferred income taxes Deferred Income Tax Assets, Net Long-term debt, gross Long-Term Debt, Gross Lessee, Operating Lease, Description Lessee, Operating Lease, Description Financial Standby Letter of Credit [Member] Financial Standby Letter of Credit [Member] Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings Disposal Group, Including Discontinued Operation, Other Assets, Current Disposal Group, Including Discontinued Operation, Other Assets, Current Related Party Transaction, Due from (to) Related Party, Current Related Party Transaction, Due from (to) Related Party, Current Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Regulatory assets 2021 [Member] Regulatory assets 2020 [Member] Regulatory assets 2020 Revenues from alternative revenue programs True-up Adjustments to Decoupling Mechanisms and Formula Rate True-up Adjustments to Decoupling Mechanisms and Formula Rate True-up Adjustments to Decoupling Mechanisms and Formula Rate Net realized and unrealized gains on NDT fund investments Gain (Loss) on Investments Gain (Loss) on Investments Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] Finance lease, liability Finance Lease, Liability Total property, plant and equipment Property, Plant and Equipment, Gross Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Deferred Prosecution Agreement Payments Deferred Prosecution Agreement Payments [Member] Deferred Prosecution Agreement Payments Inventories, net Inventory, Net [Abstract] Percent of additional decommissioning shortfall with recourse Uncollectible Decommissioning Shortfall Percentage Percent of additional decommissioning shortfall with recourse for collection from customers. Maturity Less than 30 Days [Member] Maturity Less than 30 Days [Member] Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Other paid-in capital Additional Paid in Capital Tax Benefits Tax Benefits [Member] Tax Benefits Public Utility [Axis] Public Utility [Axis] Disposal Group, Including Discontinued Operation, Revenue Disposal Group, Including Discontinued Operation, Revenue Discounted Cash Flow [Member] Valuation, Income Approach [Member] Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Contract Type [Axis] Contract Type [Axis] Contract Type Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] Schedule of Other Nonoperating Income, by Component Schedule of Other Nonoperating Income, by Component [Table Text Block] Unamortized energy contract liabilities, noncurrent Energy Marketing Contract Liabilities, Noncurrent Other non-cash operating activities Other non-cash operating activities Other Noncash Income (Expense) Amortization of Nuclear Fuel Lease Amortization of Nuclear Fuel Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items] Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. 0 Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Distributions to member Payments of Distributions to Affiliates Other accounts receivable Other Receivables, Gross, Current Remaining years Lessee, Operating Lease, Liability, to be Paid, after Year Five Equity Component [Domain] Equity Component [Domain] Selected Quarterly Financial Information [Table] Selected Quarterly Financial Information [Table] Table reflecting selected quarterly data. Subsequent Event Type [Domain] Subsequent Event Type [Domain] Interest Expense Interest Expense [Member] Retirement of long-term debt to financing trust Repayments of Related Party Debt Equity Securities Nuclear Decommissioning Trust Fund Equity Securities Nuclear Decommissioning Trust Fund [Member] Equity Securities Nuclear Decommissioning Trust Fund Ownership [Axis] Ownership [Axis] Increases based on tax positions related to current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions CorpTermLoanApr2024 CorpTermLoanApr2024 [Member] CorpTermLoanApr2024 Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Finance Lease, Right-of-Use Asset, Amortization Finance Lease, Right-of-Use Asset, Amortization Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Fair value of net plan assets as of the beginning of year Fair value of net plan assets as of the end of year Defined Benefit Plan, Plan Assets, Amount Defined Benefit Plan, Plan Assets, Amount Wind Assets [Member] Wind Assets [Member] Wind Assets [Member] Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Design Changes Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Design Changes Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Design Changes Interest Rate Derivative Assets Interest Rate Derivative Assets [Member] Interest Rate Derivative Assets Long-term line of credit/facility draws Long-Term Line of Credit Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Sale of noncontrolling interests Noncontrolling Interest, Increase from Sale of Parent Equity Interest Operating Activities [Domain] Operating Activities [Domain] Award Type [Axis] Award Type [Axis] Options expired Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Plant basis differences Effective Income Tax Rate Reconciliation, Deduction, Other, Percent Total realized / unrealized gains (losses) Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss [Abstract] This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3). Other Commitments [Domain] Other Commitments [Domain] Annual Reconciliation Increase (Decrease) Revenue Exepected adjustment to revenue to be recorded in the prior year. Total liabilities Total liabilities Liabilities Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Spent Nuclear Fuel Obligation [Table Text Block] Spent Nuclear Fuel Obligation [Table Text Block] Spent Nuclear Fuel Obligation [Table Text Block] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Proceeds from NDT fund sales Proceeds from Sale and Maturity of Other Investments Severance Costs Severance Costs Nonvested, Weighted Average Exercise Price (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Deferred Deferred Income Tax Expense (Benefit) Illinois Commerce Commission Illinois Commerce Commission [Member] Illinois Commerce Commission Maryland 2021 Electric Distribution Base Rate Case Maryland 2021 Electric Distribution Base Rate Case [Member] Maryland 2021 Electric Distribution Base Rate Case Prepaid pension asset Assets for Plan Benefits, Defined Benefit Plan April 7, 2021 April 7, 2021 [Member] April 7, 2021 Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Disposal Group, Including Discontinued Operation, Accounts Payable, Current Disposal Group, Including Discontinued Operation, Accounts Payable, Current Writeoffs, net of recoveries Accounts Receivable, Allowance for Credit Loss, Writeoff Total recognized in AOCI and regulatory assets (liabilities) Defined Benefit Plan Accumulated Other Comprehensive Income And Regulatory Assets Before Tax The pretax total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. Debt Disclosure [Abstract] Debt Disclosure [Abstract] Income Statement Location [Axis] Income Statement Location [Axis] Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Customer accounts receivable Trade Accounts Receivable [Member] Public Utilities, Approved Rate Increase (Decrease), Percentage Public Utilities, Approved Rate Increase (Decrease), Percentage Net cash flows provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Other Commitments [Axis] Other Commitments [Axis] Shareholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Customer [Axis] Customer [Axis] Private Equity Funds [Member] Private Equity Funds [Member] Interest cost Defined Benefit Plan, Interest Cost Transmission line capacity Voltage Of Transmission Lines Amount of voltage capacity in transmission lines Supplemental Balance Sheet Disclosures Supplemental Balance Sheet Disclosures [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Delaware And New Jersey [Member] Delaware And New Jersey [Member] Voltage lines located in Delaware and New Jersey Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] OCI before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Fair Value of Financial Liabilities Recorded at Amortized Cost Fair Value, by Balance Sheet Grouping [Table Text Block] Derivative Contract [Domain] Derivative Contract [Domain] Electric Operating Revenues [Member] Electric Operating Revenues [Member] This element represents the gains (losses) included in earnings that are recognized in electric operating revenues. Entity Registrant Name Entity Registrant Name 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Regulatory Assets and Liabilities by Year [Domain] Regulatory Assets and Liabilities by Year [Domain] Regulatory Assets and Liabilities by Year Subsequent Events (Exelon and Generation) Subsequent Events [Text Block] Defined Benefit Plan, Benefit Obligation, Benefits Paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Beneficial electrification planned expenditure Beneficial electrification planned expenditure Beneficial electrification planned expenditure Retirement Benefits (All Registrants) Retirement Benefits [Text Block] Leases [Abstract] Leases [Abstract] Accrual For Environmental Loss Contingencies Material Components [Axis] Accrual For Environmental Loss Contingencies Material Components [Axis] Subsegments [Axis] Subsegments [Axis] Total equity Beginning Balance Ending Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Increase (Decrease) in ARO Due to Early Retirement Increase (Decrease) in ARO Due to Early Retirement Increase (Decrease) in ARO Due to Early Retirement Asset Class [Domain] Asset Class [Domain] Minimum [Member] Minimum [Member] Under Recovered Decoupling Revenue Total Under Recovered Decoupling Revenue Total [Member] Under Recovered Decoupling Revenue Total Entity Emerging Growth Company Entity Emerging Growth Company Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Inventory Write-down Inventory Write-down Investment, Name [Axis] Investment, Name [Axis] Fair Value of Financial Assets and Liabilities (All Registrants) Fair Value Disclosures [Text Block] Operating Loss Carryforwards, Valuation Allowance Valuation allowance on state tax attributes (net of federal taxes)(b) Operating Loss Carryforwards, Valuation Allowance Entity File Number Entity File Number Operating Activities [Axis] Operating Activities [Axis] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Other Comprehensive Income (Loss) [Member] Other Comprehensive Income (Loss) [Member] Interest accrued Interest Payable, Current Other Non-Cash [Axis] Other Non-Cash [Axis] Other Non-Cash Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] InterestRateSwapNotional5YR InterestRateSwapNotional5YR [Member] InterestRateSwapNotional5YR Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Derivatives Financial Instruments (All Registrants) Derivatives, Policy [Policy Text Block] Granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Schedule of Aggregate Bank Commitments, Credit Facility Borrowings, and Available Capacity Schedule of Line of Credit Facilities [Table Text Block] Summary of Loss Carryforwards Summary of Operating Loss Carryforwards [Table Text Block] Delaware River Crossing [Member] Delaware River Crossing [Member] Delaware River Crossing [Member] Other Commitment, to be Paid, Year Two Other Commitment, to be Paid, Year Two Forward Gas Basis Forward Gas Basis Basis adjustment to the forward gas price to deliver at an illiquid location Pension and non-pension postretirement benefit plan valuation adjustment Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax Non-pension postretirement benefits obligations Liability, Other Postretirement Defined Benefit Plan, Noncurrent Due from Affiliate, Noncurrent Notes receivable from affiliates, noncurrent Due from Affiliate, Noncurrent Maryland Relief Act Funds Maryland Relief Act Funds Maryland Relief Act Funds Income Taxes (All Registrants) Income Tax Disclosure [Text Block] Operating revenues from affiliates Revenue from Related Parties Revenue from Related Parties Transfer of Financial Assets Accounted for as Sale, Additional Transfers Transfer of Financial Assets Accounted for as Sale, Additional Transfers Amount of derecognized financial assets from transactions which comprise an additional transfer resulting in retention of substantially all of the exposure to the economic return throughout the term of the transaction, at the date of derecognition. Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis, Valuation Technique Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] Credit Facility [Domain] Credit Facility [Domain] Defined Benefit Plan Change In Benefit Obligation RollForward Schedule of Changes in Accumulated Postemployment Benefit Obligations [Table Text Block] Requisite service period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period 2024 2024 [Member] 2024 Business Acquisition, Expected New Generation Mwh Business Acquisition, Expected New Generation Mwh The expected capacity of new generation development related to the acquisition settlement. Payments to Noncontrolling Interests Payments to Noncontrolling Interests Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Stock Options Exercised Stock Options Exercised [Table Text Block] Information on stock options exercised. Over Recovered Energy and Natural Gas Costs [Member] Over Recovered Energy and Natural Gas Costs [Member] Over Recovered Energy and Natural Gas Costs [Member] Change in collateral Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Change In Collateral Fair value measurement with unobservable inputs reconciliation recurring basis asset liability gain loss change in collateral. 2023 Lessor, Operating Lease, Payment to be Received, Year One Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] 2027 Finance Lease, Liability, to be Paid, Year Five Increase (decrease) in cash, restricted cash, and cash equivalents Increase (decrease) in cash, restricted cash, and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Project [Domain] Project [Domain] Derivatives Designated as Hedging Instruments Liabilities [Domain] Derivatives Designated as Hedging Instruments Liabilities [Domain] Derivatives Designated as Hedging Instruments Liabilities Income Taxes (All Registrants) Income Tax, Policy [Policy Text Block] Under-recovered revenue decoupling Under Recovered Decoupling Revenue [Member] Represents the under-recovered (regulatory asset) distribution costs recoverable from customers. An under recovery means that the actual costs of electricity or natural gas realized by the regulated utility were more than the rates charged to customers during the period and are recoverable from customers. Deferred debt refinancing costs Deferred Tax Liabilities, Deferred Expense, Debt Issuance Costs Relating to assets sold during the period Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Sold Collection of deferred purchase price Proceeds from Collection of Retained Interest in Securitized Receivables Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Effects of Netting and Allocation of Collateral Liabilities [Member] Effects of Netting and Allocation of Collateral Liabilites [Member] Effects of Netting and Allocation of Collateral Liabilites [Member] Transition costs relating to the Separation included in discontinued operations Transition costs relating to the Separation included in discontinued operations Transition costs relating to the Separation included in discontinued operations Retained earnings/Undistributed earnings (losses) Retained earnings Retained Earnings (Accumulated Deficit) External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] Settlement and other charges Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Scenario [Domain] Scenario [Domain] Fair Value, Recurring [Member] Fair Value, Recurring [Member] Related-Party Transactions (All Registrants) Related Party Transactions Disclosure [Text Block] Commodity Derivative Liabilites [Member] Commodity Derivative Liabilites [Member] Commodity Derivative Liabilites [Member] Document Fiscal Year Focus Document Fiscal Year Focus Loans Payable Two Loans Payable Two [Member] Loans Payable Two Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Changes in Accumulated Other Comprehensive Income (Exelon) Accumulated Other Comprehensive Income Loss [Text Block] Error Correction, Type [Axis] Error Correction, Type [Axis] Membership interest Members' Capital Delmarva Power & Light Company [Member] Delmarva Power and Light Company [Member] Delmarva Power and Light Company [Member] Delmarva Power and Light Company [Member] US Treasury (UST) Interest Rate US Treasury (UST) Interest Rate [Member] Generation Solar Business Generation Solar Business [Member] Generation Solar Business Assets [Member] Assets [Member] Inventories Increase (Decrease) in Inventories Unamortized debt discount and premium, net Unamortized debt discount and premium, net Debt Instrument, Unamortized Discount (Premium), Net Line of credit facility, current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Exelon significant subsidiaries Exelon significant subsidiaries [Member] Exelon significant subsidiaries Schedule of Government Settlement Agreements [Table Text Block] Schedule of Government Settlement Agreements [Table Text Block] Schedule of Government Settlement Agreements [Table Text Block] Goodwill Carrying amount Goodwill Other Current Liabilities [Member] Other Current Liabilities [Member] LTIP [Member] Long Term Incentive Plan [Member] Long Term Incentive Plan [Member] Asbestos Liability Reserve Liability for Asbestos and Environmental Claims, Gross Prepaid utility taxes Prepaid Taxes Treasury Stock, Shares Treasury Stock, Shares Commonwealth Edison Company [Member] Commonwealth Edison Company [Member] Curtailments Defined Benefit Plan Accumulated Other Comprehensive Income Curtailments Before Tax The amount of net (gain) loss recognized in accumulated other comprehensive income and regulatory assets as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the curtailment. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits. Income taxes Income Tax Expense (Benefit) Geographical [Domain] Geographical [Domain] Public Utilities Transmission Rate Filings [Table Text Block] Public Utilities Transmission Rate Filings [Table Text Block] Public Utilities Transmission Rate Filings [Table Text Block] Entity Public Float Entity Public Float Balance Sheet Location [Domain] Balance Sheet Location [Domain] Long-Term Incentive Plan Activity Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture Loss Contingencies [Line Items] Loss Contingencies [Line Items] Supplemental Cash Flow Information [Line Items] Supplemental Cash Flow Information [Line Items] Supplemental Cash Flow Information [Line Items] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Performance Metrics Penalty Performance Metrics Penalty [Member] Performance Metrics Penalty Employee benefit trusts and investments Investments Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Other Increases (Decreases) in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Other Increases (Decreases) in Period Common stock Common Stock, Value, Issued Leases of Lessor Disclosure [Text Block] Leases of Lessor Disclosure [Text Block] First Mortgage Bonds First Mortgage Bonds [Member] Bonds that are backed by the first claim on the proceeds from the sale of a specific asset or set of assets in the event that the company is liquidated. Net liabilities pending transactions excluded Net Assets Pending Transactions Excluded Common Stock Narrative Information [Line Items] Common Stock Narrative Information [Line Items] Common Stock Narrative Information [Line Items] Other current liabilities Pension obligations Liability, Defined Benefit Plan, Current Maximum increase of revenue requirement Maximum increase of revenue requirement Maximum increase of revenue requirement ABO Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Other Property Plant and Equipment Other Capitalized Property Plant and Equipment [Member] Regulatory asset increase (decrease) due to updated valuation adjustment Defined benefit plan, amounts recognized in regulatory assets, before tax Defined Benefit Plan Amounts Recognized In Regulatory Assets Before Tax The aggregate net gain or loss and net prior service cost or credit recognized in regulatory assets, including amounts arising during the period and reclassification adjustments of regulatory assets as a result of being recognized as components of net periodic benefit cost for the period. Recognition of Unrecognized Tax Benefits [Table] Recognition of Unrecognized Tax Benefits [Table] Recognition of Unrecognized Tax Benefits [Table] Exelon Foundation Charitable Contribution Exelon Foundation Charitable Contribution Exelon Foundation Charitable Contribution Cash received for exercise price Proceeds from Stock Options Exercised Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Curtailment benefits Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Allowance for Funds Used During Construction, Capitalized Interest Allowance for Funds Used During Construction, Capitalized Interest Other Solar Projects [Member] Other Solar Projects [Member] Finance Lease, Interest Expense Finance Lease, Interest Expense Undistributed vested awards Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Vested in Period, Undistributed Represents restricted stock units that are vested but not distributed to retirement-eligible employees. Increase (Decrease) in Regulatory Assets Increase (Decrease) in Other Regulatory Assets Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax UII LLC [Member] UII LLC [Member] UII LLC [Member] Goodwill, Additions Goodwill, Acquired During Period Other Commitment, to be Paid, after Year Five Other Commitment, to be Paid, after Year Five Other Receivables Other Receivables [Member] Amount due from parties in nontrade transactions, classified as other. Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Other Other Assets, Noncurrent Schedule of Regulatory Liabilities [Table] Schedule of Regulatory Liabilities [Table] Common Stock Shares Reserved For Warrant Conversion Common Stock Shares Reserved For Warrant Conversion Shares of common stock reserved for conversion of outstanding warrants. Total Realized and Unrealized Gains (Losses) Included in Income for Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block] Public Utilities, Approved Rate Increase (Decrease), Offsets [Domain] Public Utilities, Approved Rate Increase (Decrease), Offsets [Domain] Public Utilities, Approved Rate Increase (Decrease), Offsets [Domain] Commodity Contract [Member] Commodity Contract [Member] Other available for sale investments Other Available For Sale Investments [Member] Other Available For Sale Investments [Member] Counterparty Name [Axis] Counterparty Name [Axis] Current year actuarial (gain) loss Defined Benefit Plan Accumulated Other Comprehensive Income And Regulatory Assets Net Gains Losses Before Tax Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Change in Performance, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Change in Performance, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Change in Performance, Weighted Average Grant Date Fair Value Repayment of long term debt to affiliate Repayment of long term debt to affiliate Repayment of long term debt to affiliate Retirement of long-term debt Repayments of Long-Term Debt External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Share-based Payment Arrangement, Option [Member] Share-Based Payment Arrangement, Option [Member] Cumulative Preferred Stock [Member] Cumulative Preferred Stock [Member] Treasury stock, at cost Treasury Stock, Value Long-term debt to financing trusts [Member] Long-Term Debt [Member] Derivative Liability, Fair Value, Amount Not Offset Against Collateral Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Pension and non-pension postretirement benefit contributions Payment for Pension and Other Postretirement Benefits Pension and non-pension postretirement benefit contributions Payment for Pension and Other Postretirement Benefits Customer allowance for credit losses Customer allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Unrealized gain on marketable securities OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Federal and State Federal and State Federal and State Spent Nuclear Fuel Storage Reimbursement Spent Nuclear Fuel Storage Reimbursement Total of allowed cash reimbursements for received for costs incurred from the Department of Energy under the settlement agreement for spent nuclear fuel storage costs that have been incurred due to the delay in the Department of Energy accepting spent nuclear fuel. Proposed Capital Expenditure Approved Capital Expenditure Approved Capital Expenditure Operating Expenses Operating Expenses Maximum [Member] Maximum [Member] External Credit Rating, Non Investment Grade External Credit Rating, Non Investment Grade [Member] Taxes Other Than Income Taxes Schedule Of Taxes Excluding Income And Excise Taxes [Table Text Block] This element may be used to capture the table showing the different components of taxes excluding income and excise taxes. Designated as Hedging Instrument [Member] Designated as Hedging Instrument [Member] Defined Benefit Plan Weighted Average Asset Allocations And Target Allocations Defined Benefit Plan Weighted Average Asset Allocations And Target Allocations [Table Text Block] This element may be used to capture the aggregate percentage of the fair value of investments to the fair value of total plan assets held as of the measurement date and the target allocation percentage of investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position. Electric energy and natural gas costs Under Recovered Energy and Natural Gas Costs [Member] Represents the under-recovered (regulatory asset) purchased power and/or gas supply related costs recoverable from customers. An under recovery means that the actual costs of electricity or natural gas realized by the regulated utility were more than the rates charged to customers during the period and are recoverable from customers. Measurement Frequency [Domain] Measurement Frequency [Domain] Shareholders' Equity (All Registrants) [Text Block] Stockholders' Equity Note Disclosure [Text Block] Amortization of investment tax credit, including deferred taxes on basis difference Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent Calculation of Net Periodic Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Sublease Income Sublease Income ShortTermDebt03312021.2 [Member] ShortTermDebt03312021.2 [Member] ShortTermDebt03312021.2 Title of 12(b) Security Title of 12(b) Security Amortization of: Amortization of Prior Service Cost (Benefit) and Actuarial Loss [Abstract] Amortization of Prior Service Cost (Benefit) and Actuarial Loss [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Fixed Income Securities [Member] Fixed Income Securities [Member] Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax Delaware 2022 Electric Distribution Base Rate Case Delaware 2022 Electric Distribution Base Rate Case [Member] Delaware 2022 Electric Distribution Base Rate Case Subsequent Event [Line Items] Subsequent Event [Line Items] Option premiums paid, net Changes In Option Premiums Collected Received The net change during the reporting period in option premiums collected and paid. Options reflect the right or obligation to buy or sell an energy-related commodity and are classified in current and long-term mark-to-market derivative assets and liabilities. Segment Information (All Registrants) Segment Reporting Disclosure [Text Block] 2021 2021 [Member] Period increase or decrease goes into effect 2021 LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Preference Securities [Table Text Block] Preference Securities [Table Text Block] [Table Text Block] for Preference Securities [Table] Average shares of common stock outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Purchase Commitment Purchase Commitment Purchase Commitment Cash proceeds received Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount Income (Loss) from Continuing Operations, Per Basic Share Income (Loss) from Continuing Operations, Per Basic Share Capital Leases, Balance Sheet, Assets by Major Class, Net Capital Leases, Balance Sheet, Assets by Major Class, Net Business Services Company [Member] Business Services Company [Member] Business Services Company [Member] Removal costs Asset Removal Costs [Member] Asset Removal Costs [Member] Basic Average Number of Shares Outstanding Weighted Average Number of Shares Outstanding, Basic Business Disposition [Domain] Business Disposition [Domain] Business Disposition [Domain] Discontinued Operations - Cash Flows Discontinued Operations - Cash Flows [Table Text Block] Discontinued Operations - Cash Flows Target asset allocation percentage Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Derivative, Notional Amount Derivative, Notional Amount Health care cost trend rate Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Commitments And Contingencies [Table] Commitments And Contingencies [Table] Auditor Information [Abstract] Auditor Information [Abstract] Auditor Information Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Income taxes Increase (Decrease) in Income Taxes Payable Alternative Revenue [Member] Alternative Revenue [Member] Alternative Revenue Cash Collateral Posted Cash Collateral Posted Cash collateral posted related to credit risk. Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss Increase (Decrease) in Deferred Income Taxes Increase (Decrease) in Deferred Income Taxes Jurisdiction [Axis] Jurisdiction [Axis] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Period [Domain] Period [Domain] [Domain] for Period [Axis] Operating Expense [Member] Operating Expense [Member] Materials and supplies Inventory, Raw Materials and Supplies, Net of Reserves Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Asset Retirement Obligations [Table] Asset Retirement Obligations [Table] Fully Vested Stock Based Compensation Issued To Retirement Eligible Employees Fully Vested Stock Based Compensation Issued To Retirement Eligible Employees Fully vested stock based compensation issued to retirement-eligible employees Assumed Exercise and/or Distributions of Stock-Based Awards Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Notes receivable from affiliates Proceeds from Collection of Notes Receivable Rate-Regulated Natural Gas Revenues [Member] Rate-Regulated Natural Gas Revenues [Member] Rate-Regulated Natural Gas Revenues [Member] Regulatory Assets [Line Items] Regulatory Asset [Line Items] Schedule of Regulatory Liabilities Schedule of Regulatory Liabilities [Table Text Block] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Accretion expense Accretion expense Asset Retirement Obligation, Accretion Expense Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant ComEd 2022 Energy Efficiency Formula Rate [Domain] ComEd 2022 Energy Efficiency Formula Rate [Domain] ComEd 2022 Energy Efficiency Formula Rate Total current liabilities Liabilities, Current Schedule of Energy Efficiency Formula Rate Updates [Line Items] Schedule of Energy Efficiency Formula Rate Updates [Line Items] [Line Items] for Schedule of Energy Efficiency Formula Rate Updates [Table] Public Utilities, Requested Rate Increase (Decrease), Proposed Revenue Requirement Phase-In Public Utilities, Requested Rate Increase (Decrease), Proposed Revenue Requirement Phase-In Public Utilities, Requested Rate Increase (Decrease), Proposed Revenue Requirement Phase-In Unbilled Customer Revenue Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Notes Payable, Noncurrent Notes Payable, Noncurrent Other Other General Expense Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Transition bonds [Member] Transition Bonds [Member] Transition Bonds [Member] Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Other income and (deductions) Nonoperating Income (Expense) [Abstract] Contract Termination Liability Contract Termination Liability Contract Termination Liability Debt Security, Government, Non-US [Member] Debt Security, Government, Non-US [Member] Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Income Tax Authority [Domain] Income Tax Authority [Domain] Other financing activities Proceeds from (Payments for) Other Financing Activities Schedule Of Defined Contributions Schedule Of Defined Contributions [Table Text Block] This element may be used to capture the table of contributions by an employer to a defined contribution plan. Net unrealized losses (gains) on equity investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Preference Stock Redeemed [Member] Preference Stock Redeemed [Member] Preference Stock Redeemed [Member] Loans Payable Three Loans Payable Three [Member] Loans Payable Three Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Unbilled customer revenues Unbilled Contracts Receivable Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Exelon VTI, LLC [Member] Exelon VTI, LLC [Member] Exelon VTI, LLC [Member] Related Party Transaction Capitalized Costs Support Services Related Party Transaction Capitalized Costs Support Services Capitalized costs incurred for support services. Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Credit Facility [Axis] Credit Facility [Axis] Common—electric and gas Common Electric And Gas T And D Equipment [Member] Long lived, depreciable assets used for the primary purpose of providing common support to the transmission and distribution of gas and electricity to the consumer. Impact of adoption of Recognition and Measurement of Financial Assets and Liabilities standard Marketable Securities, Unrealized Gain (Loss) ShortTermDebt03232017 [Member] ShortTermDebt03232017 [Member] ShortTermDebt03232017 Investment in partnerships Deferred Tax Assets, Equity Method Investments Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Fair Value Inputs Forward Power Price Fair Value Inputs Forward Power Price Fair Value Inputs Forward Power Price Equity [Abstract] Equity [Abstract] Income before income taxes Income (Loss) Attributable to Parent, before Tax Schedule of Operating Lease, Lease Income [Line Items] Schedule of Operating Lease, Lease Income [Line Items] [Line Items] for Schedule of Operating Lease, Lease Income Components Schedule of short-term debt and long-term debt [Table] Schedule of Short-term Debt Schedule of Short-Term Debt [Table] Accumulated Benefit Obligation In Excess Of Plan Assets [Member] Accumulated Benefit Obligation In Excess Of Plan Assets [Member] The amounts related to the pension plans with an accumulated benefit obligation in excess of plan assets. Consolidated Entities [Domain] Consolidated Entities [Domain] Jointly Owned Utility Plant Interests [Table] Jointly Owned Utility Plant Interests [Table] Increase (Decrease) in ARO Due to Revisions in Assumed Retirement Dates Increase (Decrease) in ARO Due to Change in Retirement Timing Probabilities Increase (Decrease) in ARO Due to Change in Retirement Timing Probabilities Proprietary Trading Liabilities [Member] Proprietary Trading Liabilities [Member] Proprietary Trading Liabilities [Member] Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Contract Asset/Liabilities [Line Items] Contract Asset/Liabilities [Line Items] Contract Asset/Liabilities Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Retained Earnings, Unappropriated [Member] Retained Earnings, Unappropriated [Member] Baltimore Gas and Electric Company [Member] Baltimore Gas and Electric Company [Member] Entity Central Index Key Entity Central Index Key Segment Elimination [Member] Segment Elimination [Member] Segment Elimination Member created to differentiate between Intersegment Elimination member Effects of Netting and Allocation of Collateral [Member] Effects of Netting and Allocation of Collateral [Member] Effects of Netting and Allocation of Collateral [Member] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Entity [Domain] Entity [Domain] Fossil fuel and emission allowances Energy Related Inventory, Natural Gas in Storage ASSETS Assets [Abstract] Auditor [Table] Auditor [Table] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Short-term Loan Agreements [Abstract] Short-Term Debt [Abstract] Asset Class [Axis] Asset Class [Axis] 2023 Long-Term Debt, Maturity, Year One Regulatory Assets Regulatory Asset Percentage to be settled as common stock Share-based Compensation by Share-based Payment Award, Percentage of Awards to be Settled in Stock Share-based Compensation by Share-based Payment Award, Percentage of Awards to be Settled in Stock Variable Rate [Axis] Variable Rate [Axis] Natural Gas, US Regulated [Member] Natural Gas, US Regulated [Member] Class of Warrant or Right, Outstanding Class of Warrant or Right, Outstanding Other Other deferred credits and other liabilities Other Liabilities, Noncurrent Remaining Commitment [Member] Remaining Commitment [Member] Remaining Commitment [Member] Increase (decrease) in capital expenditures not paid Change in Capital Expenditures Incurred But Not Yet Paid The non cash impact of change in capital expenditures incurred but not yet paid. Regulatory Matters (All Registrants) Public Utilities Disclosure [Text Block] Share-Based Compensation Arrangement by Share-Based Payment Award, Other Share Increase (Decrease) Share-Based Compensation Arrangement by Share-Based Payment Award, Other Share Increase (Decrease) Total amounts of interest and penalties recognized Total amounts of interest and penalties recognized [Table Text Block] Total amounts of interest and penalties recognized 2023 Finite-Lived Intangible Asset, Expected Amortization, Year One Remaining years Finance Lease, Liability, to be Paid, after Year Five Notes Receivable, Related Parties Notes Receivable, Related Parties Line of credit facility, interest rate at period end Line of Credit Facility, Interest Rate at Period End Forward power price assets Fair Value Inputs Forward Power Price Assets This element represents the forward power market price used to calculate the change in fair value of the derivative instrument. Investment in affiliates Payments to Acquire Interest in Subsidiaries and Affiliates Business Description and Basis of Presentation (All Registrants) Business Description and Basis of Presentation [Text Block] Atlantic City Electric Company [Member] Atlantic City Electric Company [Member] Atlantic City Electric Company [Member] Customer [Domain] Customer [Domain] Amounts reclassified from AOCI Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Quarterly Financial Data [Abstract] Quarterly Financial Data [Abstract] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Lessee, Operating Lease, Liability, to be Paid Lessee, Operating Lease, Liability, to be Paid Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity, Primary Beneficiary [Member] Pepco Holdings LLC Affiliate [Member] Pepco Holdings LLC Affiliate [Member] Pepco Holdings LLC Affiliate [Member] Derivative Asset (Liability) Net, Measurement Input Derivative Asset (Liability) Net, Measurement Input Benefit Obligation In Excess Of Plan Assets [Domain] Benefit Obligation In Excess Of Plan Assets [Domain] 2024 Long-Term Debt, Maturity, Year Two Junior subordinated notes [Member] Junior Subordinated Debt [Member] Investments, Fair Value Disclosure Investments, Fair Value Disclosure Plan amendments Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Reserve for Obsolete Materials [Member] SEC Schedule, 12-09, Reserve, Inventory [Member] Receivable [Domain] Receivable [Domain] Operating and maintenance from affiliates Related Party Transaction, Expenses from Transactions with Related Party Related Party Transaction, Expenses from Transactions with Related Party Plant basis differences Deferred Tax Liabilities, Property, Plant and Equipment PHI Service Co Affiliate [Member] PHI Service Co Affiliate [Member] PHI Service Co Affiliate [Member] Property Real Estate Tax Expense Other investing activities Payments for (Proceeds from) Other Investing Activities Payments for (Proceeds from) Other Investing Activities Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Number of Shares, Period Increase (Decrease) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Number of Shares, Period Increase (Decrease) Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Share-Based Payment Arrangement [Abstract] PHI Merger Commitments [Table] PHI Merger Commitments [Table] PHI Merger Commitments [Table] Fair Value, Net Asset (Liability) Fair Value, Net Asset (Liability) Schedule of Alternative or Renewable Energy Credits [Table Text Block] Schedule of Alternative or Renewable Energy Credits [Table Text Block] Schedule of Alternative or Renewable Energy Credits [Table Text Block] Economic Hedging Instrument Liabilites [Member] Economic Hedging Instrument Liabilites [Member] Economic Hedging Instrument Liabilites [Member] Debt Securities [Member] Debt Securities [Member] Schedule of maturities of long-term debt Schedule of Maturities of Long-Term Debt [Table Text Block] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Gain on deconsolidation of business Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net Exelon Generation Co LLC Affiliate [Member] Exelon Generation Co LLC Affiliate [Member] Exelon Generation Co LLC Related Party Affiliate Scenario [Axis] Scenario [Axis] AFUDC—Equity Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Class of Warrant or Right [Line Items] Class of Warrant or Right [Line Items] State and municipal debt US States and Political Subdivisions Debt Securities [Member] Plan Name [Axis] Plan Name [Axis] New Jersey 2020 Electric Distribution Base Rate Case New Jersey 2020 Electric Distribution Base Rate Case [Member] New Jersey 2020 Electric Distribution Base Rate Case Share-based Payment Arrangement, Expense, after Tax Share-Based Payment Arrangement, Expense, after Tax Rabbi Trust Investments [Member] Rabbi Trust Investments [Member] This element represents the assets measured at fair value on a recurring basis related to rabbi trust investments. Lease Arrangement, Type [Domain] Lease Arrangements, Type [Domain] Lease Arrangements, Type Income (Loss) from Continuing Operations, Per Diluted Share Income (Loss) from Continuing Operations, Per Diluted Share Sites under study/remediation Mgp Site Contingency Monitoring Count Number of individual manufactured gas plant sites where monitoring or remediation activities are occurring. Recourse Status [Domain] Recourse Status [Domain] Renewable factor Fair Value Inputs Renewable Factor This element represents a factor to adjust an around the clock forward power price and quantity to be in line with an applicable renewable facility. Solar units generally produce more power in the summer days and wind units generally produce more power in the spring and fall evenings. Fair Value Of Settled Performance Share Awards Fair Value Of Settled Performance Share Awards Fair value of settled performance share awards. Deferred taxes on state tax attributes (net of federal taxes) Deferred Tax Assets, Operating Loss Carryforwards, State and Local Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Cash outflows returned Transfer of Financial Assets Accounted for as Sales, Cash Outflows Returned for Assets Derecognized, Amount Transfer of Financial Assets Accounted for as Sales, Cash Outflows Returned for Assets Derecognized, Amount Short-Term Loans, Interest rate terms Debt Instrument, Interest Rate Terms Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Capitalized Ratemaking Amounts Not Recognized [Table Text Block] Public Utilities General Disclosures [Table Text Block] Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Change in environmental liabilities Environmental Expense and Liabilities Significant Accounting Policies (All Registrants) Basis of Presentation and Significant Accounting Policies [Text Block] Long-term debt due within one year Other Long-Term Debt, Current Asset Retirement Obligations [Line Items] Asset Retirement Obligations [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Loss on Sale of Receivables Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale Dedicated facilities charge Dedicated facilities charge [Member] Dedicated facilities charge Public Utilities, Approved Rate Increase (Decrease), Tax Benefits [Axis] Public Utilities, Approved Rate Increase (Decrease), Tax Benefits [Axis] Public Utilities, Approved Rate Increase (Decrease), Tax Benefits Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Property, Plant and Equipment Property, Plant and Equipment [Member] Asset Retirement Obligations (All Registrants) Asset Retirement Obligation and Environmental Cost [Policy Text Block] Related Party Transaction [Domain] Related Party Transaction [Domain] Total transaction and transition costs incurred related to the Separation Total transaction and transition costs incurred related to the Separation Total transaction and transition costs incurred related to the Separation Expiration Date of Facility [Domain] Expiration Date of Facility [Domain] Expiration Date of Facility [Domain] Receivables [Abstract] Document Annual Report Document Annual Report Legal Entity [Axis] Legal Entity [Axis] Accounting for the Effects of Regulation (All Registrants) Public Utilities, Policy [Policy Text Block] Accounts Receivable (All Registrants) Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Amortization of Regulatory Asset Amortization of Regulatory Asset Geographical [Axis] Geographical [Axis] Utility Plant [Domain] Utility Plant [Domain] Economic Hedging Instrument [Member] Economic Hedging Instrument [Member] Economic Hedging Instrument [Member] Preference Stock, Shares Authorized Preference Stock, Shares Authorized Preference stock shares authorized. Mark-to-market derivative liabilities, current Derivative Liability, Current Market-to-market derivative liabilities, current Derivative Liability, Current Income Tax Additional Narrative Information [Line Items] Income Tax Additional Narrative Information [Line Items] Income Tax Additional Disclosure [Line Items] Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Pension and other post retirement benefit [Member] Pension and other post retirement benefit [Member] Pension and other post retirement benefit [Member] 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Product and Service [Domain] Product and Service [Domain] Deferred income taxes Deferred income taxes Deferred Income Tax Charge [Member] Entity Shell Company Entity Shell Company Included in noncurrent payables to affiliates Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Included In Noncurrent Payables To Affiliates. Decreases based on tax positions prior to current year Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Fixed Income Investments [Member] Fixed Income Investments [Member] Medium-term notes [Member] Medium-term Notes [Member] Receivables from affiliates, current Accounts receivable from affiliates, current Accounts Receivable, Related Parties, Current Basis points for ComEd's Electric Distribution rates Basis points for ComEd's Electric Distribution rates Basis points for ComEd's Electric Distribution rates SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Public Utilities Approved Rate Increase (Decrease), Prior Year Annual Reconciliation Public Utilities Approved Rate Increase (Decrease), Prior Year Annual Reconciliation Amount of public utility's requested rate increase (decrease) with regulatory agency, prior year annual reconciliation. Subsequent Event [Member] Subsequent Event [Member] Consolidation Items [Domain] Consolidation Items [Domain] Document Period End Date Document Period End Date 2027 Lessor, Operating Lease, Payment to be Received, Year Five Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] Decommissioning Related Activities Not Contractually Offset Decommissioning Related Activities Not Contractually Offset The current period expense charged against earnings on decommissioning the Byron Units that are not contractually offset. Lessor, Lease, Description [Table] Lessor, Lease, Description [Table] Auditor [Line Items] Auditor [Line Items] Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic Performance Shares [Member] Performance Shares [Member] Beginning Balance (in shares) Ending Balance (in shares) Shares, Issued Preferred Stock [Table Text Block] Preferred Stock [Table Text Block] Preferred Stock [Table Text Block] Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Options Exercised, Weighted Average Exercise Price (in usd per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price 2027 Lessee, Operating Lease, Liability, to be Paid, Year Five Schedule of Goodwill [Table] Schedule of Goodwill [Table] Plant Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service Interest Rate Cap Interest Rate Cap [Member] Merger related obligation Broker-Dealer, Payable to Customer Over-recovered revenue decoupling Over-recovered revenue decoupling [Member] Over-recovered revenue decoupling Period [Axis] Period [Axis] Period [Axis] Finance Leases Finance Leases [Member] Finance Leases Award Type [Domain] Award Type [Domain] Guarantee of Indebtedness of Others [Member] Guarantee of Indebtedness of Others [Member] 6311 Life Insurance [Member] 6311 Life Insurance [Member] Minimum expectation of tax position to be realized Minimum Expectation Of Tax Position To Be Realized Minimum Expectation Of Tax Position To Be Realized Proceeds from employee stock plans Proceeds from Stock Plans Defined Benefit Plan Purchases Defined Benefit Plan Purchases Defined Benefit Plan Purchases Total estimated future benefits payments through 2032 Defined Benefit Plan Expected Future Benefit Payments Total The total amount of the benefits expected to be paid in the future. Other Commitment, to be Paid, Year Three Other Commitment, to be Paid, Year Three District of Columbia 2019 Electric Distribution Base Rate Case District of Columbia 2019 Electric Distribution Base Rate Case [Member] District of Columbia 2019 Electric Distribution Base Rate Case [Member] Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Collateral received (posted), net Increase (Decrease) Cash Collateral from Counterparties Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority Defined benefit plan, amounts recognized in OCI, before tax Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Before Tax The aggregate net gain or loss and net prior service cost or credit recognized in other comprehensive income, including amounts arising during the period and reclassification adjustments of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period. Unrecognized Tax Benefits, Period Increase (Decrease) Unrecognized Tax Benefits, Period Increase (Decrease) LDC Damages LDC Damages [Member] LDC Damages 2028 through 2032 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Electric Generation Equipment [Member] Electric Generation Equipment [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Collateral [Member] Collateral [Member] Collateral [Member] Unamortized Energy Contracts [Member] Unamortized Energy Contracts [Member] Unamortized Energy Contracts [Member] PECO Trust III Affiliate [Member] PECO Trust Three Affiliate [Member] PECO Trust III Related Party Affiliate Amount of investment in equity method investee and investment in and advance to affiliate Amount of investment in equity method investee and investment in and advance to affiliate Amount of investment in equity method investee and investment in and advance to affiliate from discontinued operations 2026 Lessor, Operating Lease, Payment to be Received, Year Four Proceeds from New Transfers Cash Flows Between Transferor and Transferee, Proceeds from New Transfers Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Auditor Name Auditor Name Pension Plan, Defined Benefit [Member] Pension Plan, Defined Benefit [Member] Pension Plan [Member] Allocation of Federal Tax Benefit Under Tax Sharing Agreement Allocation of Federal Tax Benefit Under Tax Sharing Agreement [Table Text Block] [Table Text Block] Allocation of Federal Tax Benefit Under Tax Sharing Agreement [Table Text Block] [Table Text Block] Discontinued Operations - Balance Sheet Discontinued Operations - Balance Sheet [Table Text Block] Discontinued Operations - Balance Sheet Increases based on tax positions prior to current year Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Retained earnings appropriated Retained Earnings, Appropriated Disposal Group Classification [Axis] Disposal Group Classification [Axis] Production tax credits and other credits Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] Cash and Cash Equivalents, Fair Value Disclosure Cash and Cash Equivalents, Fair Value Disclosure Customer Refund Liability, Current Customer Refund Liability, Current Exelon Corporate [Member] Parent Company [Member] Schedule of Changes in Fair Value of Plan Assets Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Derivative, Fair Value, Amount Offset Against Collateral, Net Derivative, Fair Value, Amount Offset Against Collateral, Net London Interbank Offered Rate (LIBOR) [Member] London Interbank Offered Rate (LIBOR) [Member] Deferred purchase price Retained Interest, Fair Value Disclosure Increase (Decrease) in Obligation, Pension Benefits Increase (Decrease) in Obligation, Pension Benefits Subsequent Events [Abstract] Subsequent Events [Abstract] Other Regulatory Liabilities Other [Member] Carrying amount as of the balance sheet date of regulatory liabilities which are not elsewhere specified in the taxonomy. Community and Minority Facilities [Member] Community and Minority Facilities [Member] Community and Minority Facilities Schedule Of Goodwill Schedule of Goodwill [Table Text Block] Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent Nuclear Insurance Premiums [Member] Nuclear Insurance Premiums [Member] Retrospective nuclear insurance premiums related to ANI under the Price-Anderson Act and participation in NEIL Schedule of Capitalization, Equity [Line Items] Schedule of Capitalization, Equity [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Public Utilities, Approved Return on Equity, Percentage, Prior Year Reconciliation Public Utilities, Approved Return on Equity, Percentage, Prior Year Reconciliation Public Utilities, Approved Return on Equity, Percentage, Prior Year Reconciliation Inventories (All Registrants) Inventory, Policy [Policy Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Treasury Stock [Member] Treasury Stock [Member] Energy-related options Energy Related Options Represents the reclassification of energy-related option premiums to realized at settlement of contracts recorded in results of operations due to the settlement of the underlying transaction. Schedule of Energy Efficiency Formula Rate Updates [Table] Schedule of Energy Efficiency Formula Rate Updates [Table] Schedule of Energy Efficiency Formula Rate Updates [Table] Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Derecognized receivables transferred at fair value Transfer of Financial Assets Accounted for as Sales, Amount Derecognized 2027 Long-Term Debt, Maturity, Year Five Common stock dividends Dividends, Common Stock, Cash 2025 Lessor, Operating Lease, Payment to be Received, Year Three Defined Benefit Plan Assumptions Used In Calculations [Table] Defined Benefit Plan Assumptions Used In Calculations [Table] Table summarizing the weighted average assumptions used to determine the benefit obligation for all plans. Contract Liabilities [Member] Contract Liabilities [Member] Contract Liabilities Number of reportable segments Number of Reportable Segments Revenues (All Registrants) Revenue [Policy Text Block] Statement [Table] Statement [Table] Fair Value Assets Liabilities Measured on Recurring Basis [Table] Fair Value Assets Liabilities Measured on Recurring Basis [Table] Summarization of information required and determined to be disclosed concerning assets and liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on a recurring basis. DC PLUG charge DC PLUG Charge [Member] DC PLUG Charge [Member] Illinois Chamber of Commerce Illinois Chamber of Commerce [Member] Illinois Chamber of Commerce Deferred Tax Liability Adjustment - Noncontrolling Interest Deferred Tax Liability Adjustment - Noncontrolling Interest Deferred Tax Liability related to CENG Put Change in Contract with Customer, Asset and Liability [Table] Change in Contract with Customer, Asset and Liability [Table] Change in Contract with Customer, Asset and Liability Nontrade Receivables, Current Nontrade Receivables, Current InterestRateSwapNotional10YR InterestRateSwapNotional10YR [Member] InterestRateSwapNotional10YR Statistical Measurement [Axis] Statistical Measurement [Axis] Related Party Transaction [Axis] Related Party Transaction [Axis] Deferred Tax Liabilities, Other Finite-Lived Assets Deferred Tax Liabilities, Other Finite-Lived Assets Asset divestitures Asset Retirement Obligation, Liabilities Settled Jointly Owned Utility Plant Interests [Line Items] Jointly Owned Utility Plant Interests [Line Items] Sale of noncontrolling interest Proceeds from Noncontrolling Interests PHI Merger [Member] PHI Merger [Member] PHI Merger [Member] Options Expired, Weighted Average Exercise Price (in usd per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] SEC Schedule, 12-09, Allowance, Notes Receivable [Member] SEC Schedule, 12-09, Allowance, Notes Receivable [Member] Gain on sales of assets and businesses Gain (Loss) on Sale of Assets and Asset Impairment Charges Gain (Loss) on Sale of Assets and Asset Impairment Charges Equity in losses of unconsolidated affiliates Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Beginning Balance Ending Balance Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Total other income and (deductions) Nonoperating Income (Expense) Total other income Nonoperating Income (Expense) Variable Rate [Domain] Variable Rate [Domain] Gross Finite-Lived Intangible Assets, Gross Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Deferred pension and postretirement obligation Deferred Tax Liabilities Deferred Pension And Other Postretirement Benefit Obligation The amount as of the balance sheet date of the estimated future tax effects attributable to the deferred pension and other postretirement benefit obligation. Electric Distribution Formula Rate One-time Events [Member] Electric Distribution Formula Rate One-time Events [Member] Electric Distribution Formula Rate One-time Events [Member] Type of Restructuring [Domain] Type of Restructuring [Domain] Document Transition Report Document Transition Report 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Local Phone Number Local Phone Number Disposal Group, Including Discontinued Operations, Assets, Current - Assets held for sale Disposal Group, Including Discontinued Operations, Assets, Current - Assets held for sale Disposal Group, Including Discontinued Operations, Assets, Current - Assets held for sale Schedule of Share-based Compensation, Stock Options, Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Operating income (loss) Operating Loss Operating Income (Loss) Other Cost and Expense, Operating Operating and maintenance Other Cost and Expense, Operating Current portion of DC PLUG obligation Accrued Liabilities and Other Liabilities Exelon Enterprise [Member] Exelon Enterprise [Member] Exelon Enterprise [Member] Depreciation and Amortization (All Registrants) Depreciation, Depletion, and Amortization [Policy Text Block] Operating Lease Income Operating Lease, Lease Income, Lease Payments Excess deferred tax amortization Effective Income Tax Rate Reconciliation, Change in Enacted Tax Law, Percent Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to change in enacted tax law, excluding changes in the income tax rates. Intangible Assets (Exelon, ComEd, PHI, Pepco, DPL, and ACE) Goodwill and Intangible Assets Disclosure [Text Block] Prior service costs Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] COVID-19 Regulatory Asset COVID-19 Regulatory Asset [Member] COVID-19 Regulatory Asset Maryland 2022 Electric Distribution Base Rate Case Maryland 2022 Electric Distribution Base Rate Case [Member] Maryland 2022 Electric Distribution Base Rate Case Property Plant And Equipment (All Registrants) Property, Plant and Equipment, Policy [Policy Text Block] Asset impairments Impairment, Long-Lived Asset, Held-for-Use Document Fiscal Period Focus Document Fiscal Period Focus Zion Station [Member] Zion Station [Member] Zion Station Derivative [Line Items] Derivative [Line Items] Short-Term Loans Short-Term Bank Loans and Notes Payable Generation commodities and services [Member] Energy Commodities and Service [Member] Regulatory assets, noncurrent Noncurrent regulatory assets Regulatory Asset, Noncurrent Interest Expense, net Interest Expense, Borrowings Regulatory liabilities, current Regulatory Liability, Current Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract] Jointly Owned Utility Plant, Net Ownership Amount [Abstract] Reported Value Measurement [Member] Reported Value Measurement [Member] Electricity, US Regulated [Member] Electricity, US Regulated [Member] Constant Maturity Treasury Interest Rate Swaps Constant Maturity Treasury Interest Rate Swaps [Member] Constant Maturity Treasury Interest Rate Swaps Environmental loss contingencies Accrual for Environmental Loss Contingencies, Component Amount Allocation Of Federal Tax Benefit Under Tax Sharing Agreement Allocation Of Federal Tax Benefit Under Tax Sharing Agreement Federal income tax benefits allocated by a parent entity to its subsidiaries under a mutually agreed-upon tax sharing agreement, for which the goal is that the subsidiaries are responsible for the same amount of income tax expense or benefits that they would owe or receive had the subsidiary been separately subject to tax. Allocations of income tax benefits are treated as contributions of capital to the subsidiaries. Short-term Debt [Line Items] Short-Term Debt [Line Items] Compensation-related accruals Accrued Compensation Current Carrying value as of the balance sheet date of obligations incurred and payable for payroll, employee benefits, incentive compensation and vacation. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Operating Segments [Member] Operating Segments [Member] Shares Exercisable, Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Short-term Lease, Cost Short-Term Lease, Cost Private Placement [Member] Private Placement [Member] Income tax expense related to separation Income tax expense related to separation Forward gas price assets Fair Value Inputs Forward Gas Price Assets This element represents the forward power market price used to calculate the change in fair value of the derivative instrument. Miles of transmission voltage lines Miles Of Transmission Voltage Lines Total number of miles of 500,000 voltage transmission lines Issuance of long-term debt Issuance of long-term debt Proceeds from Issuance of Long-Term Debt Net income (loss) attributable to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Current liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Current Equity Method Investments Equity Method Investments Pledged Status [Domain] Pledged Status [Domain] Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes Facility Closing [Member] Facility Closing [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Public Utilities, Requested Equity Capital Structure, Percentage Public Utilities, Requested Equity Capital Structure, Percentage Debt Instrument, Face Amount Debt Instrument, Face Amount Spent Nuclear Fuel Treasury Interest Rate Spent Nuclear Fuel Treasury Interest Rate - ComEd Interest rate used to calculated interest accrued on one-time fee applicable to nuclear generation through April 6, 1983 under the standard contracts with the Department of Energy which was elected to be deferred with interest until just prior to the first delivery of spent nuclear fuel to the Department of Energy. The interest rate used is the 13-week Treasury Rate. Employee stock purchase plan issuances Stock Issued During Period, Value, Employee Stock Purchase Plan Comprehensive income (loss) attributable to common shareholders Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Distribution of Constellation Distribution of Constellation Distribution of Constellation External Counterparties External Counterparties [Member] External Counterparties Condensed Financial Information Disclosure [Abstract] Condensed Financial Information Disclosure [Abstract] Other Other current liabilities Other Liabilities, Current Income Taxes [Line Items] Income Taxes [Line Items] Payments for Restructuring Payments for Restructuring Accrual for Environmental Loss Contingencies, Gross Accrual for Environmental Loss Contingencies, Gross Sale of Accounts Receivable_Three Months Ended Q1 2021 Sale of Accounts Receivable_Three Months Ended Q1 2021 [Member] Sale of Accounts Receivable_Three Months Ended Q1 2021 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease) 2023 Finance Lease, Liability, to be Paid, Year One Public Utilities, Property, Plant and Equipment [Abstract] Public Utilities, Property, Plant and Equipment [Abstract] Other Non-Cash [Member] Other Non- Cash [Member] Other Non- Cash Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Supplemental Balance Sheet Information Related to Lessee Right-of-Use Assets and Lease Liabilities [Table Text Block] Supplemental Balance Sheet Information Related to Lessee Right-of-Use Assets and Lease Liabilities [Table Text Block] Supplemental Balance Sheet Information Related to Operating and Finance Lease Right-of-Use Assets and Lease Liabilities Charged to Costs and Expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Derivative [Table] Derivative [Table] Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement Maryland 2020 Electric Distribution Base Rate Case [Member] Maryland 2020 Electric Distribution Base Rate Case [Member] Maryland 2020 Electric Distribution Base Rate Case 2024 Finance Lease, Liability, to be Paid, Year Two Depreciation, amortization and accretion, including nuclear fuel and energy contract amortization Depreciation, Amortization and Accretion, Net Total depreciation, amortization and accretion Depreciation, Amortization and Accretion, Net Difference between Carrying Value and Fair Value [Member] Difference between Carrying Value and Fair Value [Member] Difference between Carrying Value and Fair Value [Member] Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Balance Sheet Location [Axis] Balance Sheet Location [Axis] Severance (All Registrants) Restructuring and Related Activities Disclosure [Text Block] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Accumulated other comprehensive loss, net Accumulated Other Comprehensive Income (Loss), Net of Tax Movement in Accumulated Other Comprehensive Income [Roll Forward] Movement in Accumulated Other Comprehensive Income [Roll Forward] Movement in Accumulated Other Comprehensive Income [Roll Forward] Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination Receivable from Exelon/PHI intercompany money pool Due from Affiliate, Current Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Share-based Payment Arrangement [Member] Share-Based Payment Arrangement [Member] Distributions to member Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared Total current assets Assets, Current Entity Small Business Entity Small Business Variable Lease Income Operating Lease, Variable Lease Income Operating revenues Revenues [Abstract] Net Finite-Lived Intangible Assets, Net Public Utilities Energy Efficiency Revenue [Table Text Block] Public Utilities Energy Efficiency Revenue [Table Text Block] Public Utilities Energy Efficiency Revenue [Table Text Block] Regulatory liabilities, noncurrent Noncurrent regulatory liabilities Regulatory Liability, Noncurrent Asset Retirement Obligation Rollforward Schedule of Change in Asset Retirement Obligation [Table Text Block] Derivative Asset, Notional Amount Derivative Asset, Notional Amount Proprietary Trading [Member] Proprietary Trading [Member] Energy-related derivative contracts entered into purely to profit from market prices changes as opposed to hedging an exposure. Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Property, Plant and Equipment (All Registrants) Property, Plant and Equipment Disclosure [Text Block] Gas Distribution Equipment Gas Distribution Equipment [Member] Option Model Valuation Technique [Member] Option Model Valuation Technique [Member] Option model approach valuation technique used to measure fair value. Prior service benefit reclassified to periodic benefit cost Prior service benefit reclassified to periodic cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax Public Utilities, General Disclosures [Line Items] Public Utilities, General Disclosures [Line Items] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] PHI Service Company [Member] PHI Service Company [Member] PHI Service Company [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Subordinated Borrowing, Interest Rate Subordinated Borrowing, Interest Rate Error Correction, Type [Domain] Error Correction, Type [Domain] Short-term and Long-term Debt [Line Items] Debt Instrument [Line Items] Debt Instrument [Line Items] Class of Stock [Line Items] Class of Stock [Line Items] Cost of spent nuclear fuel disposal per kWh of net nuclear generation Cost Of Spent Nuclear Fuel Disposal Costs per kWh of net nuclear generation required to be paid to the Department of Energy per contracts under the Nuclear Waste Policy Act of 1982. Cost can be adjusted prospectively in order to ensure full cost recovery. Increase (decrease) in PPE related to ARO update Costs Incurred, Asset Retirement Obligation Incurred 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Two Total Lessor, Operating Lease, Payments to be Received Lessor, Operating Lease, Payments to be Received Accrual For MGP Investigation And Remediation [Member] Accrual For MGP Investigation And Remediation [Member] Represents the portion of the total environmental investigation and remediation reserve related to manufactured gas plant investigation and remediation. PHI Merger Commitments [Table Text Block] PHI Merger Commitments [Table Text Block] PHI Merger Commitments [Table Text Block] Carbon Mitigation Credit Rider Carbon Mitigation Credit Rider [Member] Carbon Mitigation Credit Rider Assets, Total [Member] Assets, Total [Member] Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Table] Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Table] Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Table] Pension and Other Postretirement Plans Costs [Member] Pension and Other Postretirement Plans Costs [Member] Regulatory Matters Pending Rate Cases [Table] Regulatory Matters Pending Rate Cases [Table] Regulatory Matters Pending Rate Cases [Table] Fair Value Reconciliation of Level 3 Assets and Liabilities Measured on a Recurring Basis [Table] Fair Value Reconciliation of Level 3 Assets and Liabilities Measured on a Recurring Basis [Table] Summarization of information required and determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of assets and liabilities using significant unobservable inputs (Level 3). Such reconciliation, separately presenting changes during the period, at a minimum, may include: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs). Intangible Asset Nineteen Ninety Nine Chicago Settlement Agreement [Member] Intangible Asset Nineteen Ninety Nine Chicago Settlement Agreement [Member] Intangible asset recognized as a result of payments made by ComEd to the City of Chicago under a settlement agreement entered in 1999. The asset is being amortized ratably over the remaining term of the agreement, which ends in 2020. Asset Impairments (Exelon and BGE) Asset Impairment Charges [Text Block] Spent Nuclear Fuel Storage Reimbursement Net Co Owners Spent Nuclear Fuel Storage Reimbursement Net Co Owners Total of allowed cash reimbursements received for cost incurred from the Department of Energy under the settlement agreement for spent nuclear fuel storage costs that have been incurred due to the delay in the Department of Energy accepting spent nuclear fuel after considering amounts due to co-owners. Other decommissioning related-activity Other Decommissioning Related Activity This item represents realized and unrealized gains (losses) for the period as a result of selling and holding marketable securities in nuclear decommissioning trust funds. Additionally, this item includes the elimination of operating revenues, asset retirement obligation accretion, asset retirement cost amortization, investment income and income taxes related to nuclear decommissioning trust fund activity. As a result of certain regulatory agreements for these nuclear decommissioning trust funds; upon completion of decommissioning activities, excess (shortfall of) funds will be refunded to (recovered from) rate payers through a regulated affiliate. Therefore, this activity is contractually eliminated within the income statement. Pension obligations Liability, Defined Benefit Pension Plan, Noncurrent Supplemental Statement of Operations Information [Line Items] Supplemental Statement of Operations Information [Line Items] Supplemental Statement of Operations Information Line Item Entity Filer Category Entity Filer Category Share-based Payment Arrangement, Expense Share-Based Payment Arrangement, Expense Schedule of Lessee, Finance Lease, Liability, Maturity [Line Items] Schedule of Lessee, Finance Lease, Liability, Maturity [Line Items] Schedule of Lessee, Finance Lease, Liability, Maturity Security Exchange Name Security Exchange Name Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] Deferred Compensation Arrangement with Individual, Share-Based Payments [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Net Assets Net Assets Currents assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets, Current Outstanding letters of credit Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Schedule of Lessee, Finance Lease, Liability, Maturity [Table] Schedule of Lessee, Finance Lease, Liability, Maturity [Table] Schedule of Lessee, Finance Lease, Liability, Maturity Settlements Defined Benefit Plan Recognized Net Gain Loss Due To Settlements2 Defined benefit plan recognized net gain loss due to settlements Maximum recovery limit from a nuclear industry mutual insurance company in the event of multiple losses Mutual Property Insurance Maximum Recovery Limit For Multiple Losses This represents the maximum total recovery for all losses by all insureds of an industry mutual insurance company in the event of multiple losses by multiple insureds within a twelve-month period. Electric—transmission and distribution Electric Transmission and Distribution Equipment [Member] Regulatory Liability [Axis] Regulatory Liability [Axis] CENG Legacy Benefit Plans [Member] CENG Legacy Benefit Plans [Member] Represents Legacy benefit plans for the CENG entity. Cash and Cash Equivalents [Member] Cash and Cash Equivalents [Member] Cover [Abstract] Derivative [Member] Derivative [Member] Amortization of prior service (cost) credit Defined Benefit Plan Accumulated Other Comprehensive Income And Regulatory Assets Amortization Of Prior Service Cost The amounts in accumulated other comprehensive income and regulatory assets related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented. Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Modification of Contract Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Modification of Contract Segment Reporting [Abstract] Segment Reporting [Abstract] Schedule of Basis Spread Schedule of Basis Spread [Table Text Block] Schedule of Basis Spread Mark-to-market derivative assets, current Mark-to-market derivative assets, current Derivative Asset, Current Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Proceeds from sales of assets and businesses Proceeds from Sale of Property Held-for-sale Cash Cash Operating Loss Carryforwards, Expiration Date Operating Loss Carryforwards, Expiration Date Fair Value Net Assets Liabilities Excluded From Nuclear Decommissioning Trust Fund Investments Fair Value Net Assets Liabilities Excluded From Nuclear Decommissioning Trust Fund Investments This element represents total net assets (liabilities) excluded from nuclear decommissioning trust fund investment total. The amount consists of payables related to pending securities purchases net of cash, interest receivables and receivables related to pending securities for the respective periods. Deferred income taxes and unamortized investment tax credits Deferred Income Taxes and Other Tax Liabilities, Noncurrent Asset Retirement Obligation, Current Asset Retirement Obligation, Current Supplemental Balance Sheet Information [Line Items] Supplemental Balance Sheet Information [Line Items] Supplemental Balance Sheet Information. Pension and non-pension postretirement benefit costs Pension and Other Postretirement Benefits Cost (Reversal of Cost) Change in Assumptions for Defined Benefit Plans [Member] Change in Assumptions for Defined Benefit Plans [Member] Supplemental Balance Sheet Information [Table] Supplemental Balance Sheet Information [Table] Schedule disclosing additional information about a registrants assets and liabilities in their statement of financial position. Consolidation Items [Axis] Consolidation Items [Axis] Investments [Abstract] Long-Term Investments [Abstract] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Two Other Other Assets, Current Taxes Directly Imposed on Revenue-Producing Transactions Revenue, Transaction Price Measurement, Tax Exclusion [Policy Text Block] Equity Securities [Member] Equity Securities [Member] Delmarva Power & Light Co Delmarva Power & Light Co [Member] Delmarva Power & Light Co Discount rate Discount rate - Net Periodic Benefit Costs Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Lessee, Operating Lease, Liability, Maturity [Table Text Block] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Real Estate Funds [Member] Real Estate Funds [Member] Beginning Balance - Contract Liabilities Ending Balance - Contract Liabilities Contract with Customer, Liability Tax Credit Carryforward, Expiration Date Tax Credit Carryforward, Expiration Date Long-term incentive plan Employee Benefit and Share-Based Payment Arrangement, Noncash Acquisition of CENG noncontrolling interest Payments to Acquire Additional Interest in Subsidiaries Increase (Decrease) in ARO Due to Updated Cost Escalation Rates and Discount Rates Increase (Decrease) in ARO Due to Updated Cost Escalation Rates and Discount Rates Increase (Decrease) in ARO Due to Updated Cost Escalation Rates and Discount Rates Class of Stock [Domain] Class of Stock [Domain] Total Defined Benefit Plan Accumulated Other Comprehensive Income And Regulatory Assets Before Tax Not Yet Recognized The pretax total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income and regulatory assets associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. Accounts Receivable, Allowance for Credit Loss [Line Items] Accounts Receivable, Allowance for Credit Loss [Line Items] Line Items for Accounts Receivable, Allowance for Credit Loss [Table] Defined Benefit Plan Sales Defined Benefit Plan Sales Defined Benefit Plan Sales Accounts Receivable, Related Parties, Sale Accounts Receivable, Related Parties, Sale Accounts Receivable, Related Parties, Sale Retirement Plan Type [Axis] Retirement Plan Type [Axis] Schedule of Rent Expense [Table Text Block] Schedule of Rent Expense [Table Text Block] Maryland 2020 Gas Distribution Base Rate Case [Member] Maryland 2020 Gas Distribution Base Rate Case [Member] Maryland 2020 Gas Distribution Base Rate Case Schedule of long-term debt instruments Schedule of Long-Term Debt Instruments [Table Text Block] Unamortized debt issuance costs Unamortized Debt Issuance Expense Defined Benefit Plan Assumptions Used In Calculations [Line Items] Defined Benefit Plan Assumptions Used In Calculations [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Public Utilities Distribution Rate Cases [Table Text Block] Public Utilities Distribution Rate Cases [Table Text Block] Public Utilities Distribution Rate Cases [Table Text Block] Appropriation of retained earnings for future dividends Earnings Reclassification Earnings reclassified from Unappropriated Retained Earnings to Appropriated Retained Earnings for future dividends Removal costs Removal Costs [Member] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Gain on deconsolidation of business Deconsolidation, Gain (Loss), Amount Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Finance Lease, Interest Payment on Liability Finance Lease, Interest Payment on Liability Common Stock, No Par Value Common Stock, No Par Value Total deferred income tax liabilities (net) and unamortized investment tax credits Deferred Income Tax Liabilities And Accumulated Deferred Investment Tax Credit The sum of the cumulative amount of all deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax, and the noncurrent portion of the reserve for accumulated deferred investment tax credits as of the balance sheet date. Shortfall of decommissioning funds with recourse Uncollectible Decommissioning Shortfall Amount of decommissioning shortfall with recourse for collection from customers. Severance Liability Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Commercial Paper Commercial Paper [Member] 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Five Accrued environmental liabilities Schedule of Environmental Loss Contingencies by Site [Table Text Block] Property, plant, and equipment, deferred debits, and other assets of discontinued operations Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent Accounting Standards Update [Domain] Accounting Standards Update [Domain] Long-Term Marginal State Income Tax Rate [Table] Long-Term Marginal State Income Tax Rate [Table] Long-Term Marginal State Income Tax Rate [Table] Allowance change due to sale of customer accounts Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Benefits included in accumulated other comprehensive income Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Other Debt Obligations [Member] Other Debt Obligations [Member] Net Periodic Benefit Cost Investment Crediting Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate Interest Crediting Rate Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Preference Stock, Shares Outstanding Preference Stock, Shares Outstanding Preference stock shares outstanding. Pepco Holdings LLC [Member] Pepco Holdings LLC [Member] Pepco Holdings LLC [Member] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Asset Impairment Charges Asset Impairment Charges Contract Liabilities [Roll Forward] Disaggregation of Revenue [Line Items] Changes in Exelon/PHI intercompany money pool Changes in Exelon/PHI intercompany money pool (financing) Changes in Exelon/PHI intercompany money pool (financing) Receivable related to Regulatory Agreement Units Nontrade Receivables, Noncurrent Taxes other than income Taxes, Miscellaneous Taxes, Miscellaneous Mark-to-market derivative liabilities, noncurrent Derivative Liability, Noncurrent Derivative Liability, Noncurrent Derivative Liability, Noncurrent