Baltimore Gas and Electric Company [Member] Baltimore Gas and Electric Company [Member] Entity Address, State or Province Entity Address, State or Province Document Information, Document [Axis] Document Information, Document [Axis] Entity Tax Identification Number Entity Tax Identification Number Document Information [Line Items] Document Information [Line Items] Title of 12(b) Security Title of 12(b) Security Entity File Number Entity File Number Written Communications Written Communications Document Information [Table] Document Information [Table] Geographical [Axis] Geographical [Axis] Entity Emerging Growth Company Entity Emerging Growth Company Potomac Electric Power Company [Member] Potomac Electric Power Company [Member] Potomac Electric Power Company [Member] Entity [Domain] Entity [Domain] Soliciting Material Soliciting Material PECO Energy Co [Member] PECO Energy Co [Member] PECO Energy Co [Member] Address Type [Domain] Address Type [Domain] City Area Code City Area Code Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Local Phone Number Local Phone Number DISTRICT OF COLUMBIA DISTRICT OF COLUMBIA Legal Entity [Axis] Legal Entity [Axis] Cover page. Cover [Abstract] DELAWARE DELAWARE Pre-commencement Tender Offer Pre-commencement Tender Offer Amendment Flag Amendment Flag Entity Addresses, Address Type [Axis] Entity Addresses, Address Type [Axis] Delmarva Power and Light Company [Member] Delmarva Power and Light Company [Member] Delmarva Power and Light Company [Member] Exelon Generation Co L L C [Member] Exelon Generation Co L L C [Member] Exelon Generation Co LLC [Member] Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Geographical [Domain] Geographical [Domain] Pepco Holdings LLC [Member] Pepco Holdings LLC [Member] Pepco Holdings LLC [Member] Commonwealth Edison Co [Member] Commonwealth Edison Co [Member] Commonwealth Edison Co [Member] Trading Symbol Trading Symbol Document Period End Date Document Period End Date VIRGINIA VIRGINIA Document Type Document Type Entity Registrant Name Entity Registrant Name Former Address Former Address [Member] Entity Address, City or Town Entity Address, City or Town Entity Address, Postal Zip Code Entity Address, Postal Zip Code Atlantic City Electric Company [Member] Atlantic City Electric Company [Member] Atlantic City Electric Company [Member] Entity Central Index Key Entity Central Index Key Document [Domain] Document [Domain] Security Exchange Name Security Exchange Name