exc-20240331
Cumulative Preferred Security, Series DMarch 31, 2024March 31, 2024March 31, 2024March 31, 2024March 31, 2024March 31, 2024March 31, 2024March 31, 2024falsefalsefalsefalsefalsefalsefalsefalse20242024202420242024202420242024Q1Q1Q1Q1Q1Q1Q1Q1December 31December 31December 31December 31December 31December 31December 31December 3100011093570000022606000007810000000094660001135971000007973200000278790000008192N/A0.750.750.750.750.75111111111111111111110001109357exc:PecoEnergyCoMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMember2024-01-012024-03-310001109357exc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-3100011093572024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMember2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMemberstpr:DC2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMemberstpr:VA2024-01-012024-03-310001109357stpr:DEexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberstpr:VA2024-01-012024-03-3100011093572024-03-31xbrli:shares0001109357exc:CommonwealthEdisonCoMember2024-03-310001109357exc:PecoEnergyCoMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMember2024-03-310001109357exc:PotomacElectricPowerCompanyMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMember2024-03-310001109357exc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:ElectricityUsRegulatedMember2024-01-012024-03-31iso4217:USD0001109357us-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMember2023-01-012023-03-3100011093572023-01-012023-03-310001109357us-gaap:RelatedPartyMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMember2023-01-012023-03-31iso4217:USDxbrli:shares00011093572023-12-3100011093572022-12-3100011093572023-03-310001109357us-gaap:NonrelatedPartyMember2024-03-310001109357us-gaap:NonrelatedPartyMember2023-12-310001109357us-gaap:RelatedPartyMember2024-03-310001109357us-gaap:RelatedPartyMember2023-12-310001109357us-gaap:CommonStockMember2023-12-310001109357us-gaap:TreasuryStockCommonMember2023-12-310001109357us-gaap:RetainedEarningsMember2023-12-310001109357us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-12-310001109357us-gaap:RetainedEarningsMember2024-01-012024-03-310001109357us-gaap:CommonStockMember2024-01-012024-03-310001109357us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-01-012024-03-310001109357us-gaap:CommonStockMember2024-03-310001109357us-gaap:TreasuryStockCommonMember2024-03-310001109357us-gaap:RetainedEarningsMember2024-03-310001109357us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-03-310001109357us-gaap:CommonStockMember2022-12-310001109357us-gaap:TreasuryStockCommonMember2022-12-310001109357us-gaap:RetainedEarningsMember2022-12-310001109357us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-12-310001109357us-gaap:RetainedEarningsMember2023-01-012023-03-310001109357us-gaap:CommonStockMember2023-01-012023-03-310001109357us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-01-012023-03-310001109357us-gaap:CommonStockMember2023-03-310001109357us-gaap:TreasuryStockCommonMember2023-03-310001109357us-gaap:RetainedEarningsMember2023-03-310001109357us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMember2023-12-310001109357exc:CommonwealthEdisonCoMember2022-12-310001109357exc:CommonwealthEdisonCoMember2023-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMember2023-12-310001109357us-gaap:NonrelatedPartyMemberexc:CommonwealthEdisonCoMember2024-03-310001109357us-gaap:NonrelatedPartyMemberexc:CommonwealthEdisonCoMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:CommonStockMember2023-12-310001109357us-gaap:OtherAdditionalCapitalMemberexc:CommonwealthEdisonCoMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:CommonwealthEdisonCoMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:CommonwealthEdisonCoMember2024-01-012024-03-310001109357us-gaap:OtherAdditionalCapitalMemberexc:CommonwealthEdisonCoMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:CommonStockMember2024-03-310001109357us-gaap:OtherAdditionalCapitalMemberexc:CommonwealthEdisonCoMember2024-03-310001109357us-gaap:RetainedEarningsMemberexc:CommonwealthEdisonCoMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:CommonStockMember2022-12-310001109357us-gaap:OtherAdditionalCapitalMemberexc:CommonwealthEdisonCoMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:CommonwealthEdisonCoMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:CommonwealthEdisonCoMember2023-01-012023-03-310001109357us-gaap:OtherAdditionalCapitalMemberexc:CommonwealthEdisonCoMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:CommonStockMember2023-03-310001109357us-gaap:OtherAdditionalCapitalMemberexc:CommonwealthEdisonCoMember2023-03-310001109357us-gaap:RetainedEarningsMemberexc:CommonwealthEdisonCoMember2023-03-310001109357exc:PecoEnergyCoMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PecoEnergyCoMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PecoEnergyCoMember2023-01-012023-03-310001109357exc:PecoEnergyCoMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMember2023-01-012023-03-310001109357exc:PecoEnergyCoMember2023-12-310001109357exc:PecoEnergyCoMember2022-12-310001109357exc:PecoEnergyCoMember2023-03-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMember2023-12-310001109357us-gaap:NonrelatedPartyMemberexc:PecoEnergyCoMember2024-03-310001109357us-gaap:NonrelatedPartyMemberexc:PecoEnergyCoMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:CommonStockMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:PecoEnergyCoMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:PecoEnergyCoMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberus-gaap:CommonStockMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberus-gaap:CommonStockMember2024-03-310001109357us-gaap:RetainedEarningsMemberexc:PecoEnergyCoMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:CommonStockMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:PecoEnergyCoMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:PecoEnergyCoMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberus-gaap:CommonStockMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberus-gaap:CommonStockMember2023-03-310001109357us-gaap:RetainedEarningsMemberexc:PecoEnergyCoMember2023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RelatedPartyMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RelatedPartyMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMember2022-12-310001109357exc:BaltimoreGasAndElectricCompanyMember2023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:NonrelatedPartyMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:NonrelatedPartyMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RelatedPartyMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RelatedPartyMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:CommonStockMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:BaltimoreGasAndElectricCompanyMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:BaltimoreGasAndElectricCompanyMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:CommonStockMember2024-03-310001109357us-gaap:RetainedEarningsMemberexc:BaltimoreGasAndElectricCompanyMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:CommonStockMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:BaltimoreGasAndElectricCompanyMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:BaltimoreGasAndElectricCompanyMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:CommonStockMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:CommonStockMember2023-03-310001109357us-gaap:RetainedEarningsMemberexc:BaltimoreGasAndElectricCompanyMember2023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:PepcoHoldingsLLCMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:PepcoHoldingsLLCMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMember2023-12-310001109357exc:PepcoHoldingsLLCMember2022-12-310001109357exc:PepcoHoldingsLLCMember2024-03-310001109357exc:PepcoHoldingsLLCMember2023-03-310001109357us-gaap:RelatedPartyMemberexc:PepcoHoldingsLLCMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:PepcoHoldingsLLCMember2023-12-310001109357us-gaap:NonrelatedPartyMemberexc:PepcoHoldingsLLCMember2024-03-310001109357us-gaap:NonrelatedPartyMemberexc:PepcoHoldingsLLCMember2023-12-310001109357exc:MembershipInterestMemberexc:PepcoHoldingsLLCMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:PepcoHoldingsLLCMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:PepcoHoldingsLLCMember2024-01-012024-03-310001109357exc:MembershipInterestMemberexc:PepcoHoldingsLLCMember2024-01-012024-03-310001109357exc:MembershipInterestMemberexc:PepcoHoldingsLLCMember2024-03-310001109357us-gaap:RetainedEarningsMemberexc:PepcoHoldingsLLCMember2024-03-310001109357exc:MembershipInterestMemberexc:PepcoHoldingsLLCMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:PepcoHoldingsLLCMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:PepcoHoldingsLLCMember2023-01-012023-03-310001109357exc:MembershipInterestMemberexc:PepcoHoldingsLLCMember2023-01-012023-03-310001109357exc:MembershipInterestMemberexc:PepcoHoldingsLLCMember2023-03-310001109357us-gaap:RetainedEarningsMemberexc:PepcoHoldingsLLCMember2023-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357exc:PotomacElectricPowerCompanyMember2023-12-310001109357exc:PotomacElectricPowerCompanyMember2022-12-310001109357exc:PotomacElectricPowerCompanyMember2023-03-310001109357us-gaap:RelatedPartyMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:PotomacElectricPowerCompanyMember2023-12-310001109357us-gaap:NonrelatedPartyMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357us-gaap:NonrelatedPartyMemberexc:PotomacElectricPowerCompanyMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:CommonStockMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:PotomacElectricPowerCompanyMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:CommonStockMember2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:CommonStockMember2024-03-310001109357us-gaap:RetainedEarningsMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:CommonStockMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:PotomacElectricPowerCompanyMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:CommonStockMember2023-01-012023-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:CommonStockMember2023-03-310001109357us-gaap:RetainedEarningsMemberexc:PotomacElectricPowerCompanyMember2023-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357exc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357exc:DelmarvaPowerandLightCompanyMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMember2022-12-310001109357exc:DelmarvaPowerandLightCompanyMember2023-03-310001109357us-gaap:RelatedPartyMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:DelmarvaPowerandLightCompanyMember2023-12-310001109357us-gaap:NonrelatedPartyMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357us-gaap:NonrelatedPartyMemberexc:DelmarvaPowerandLightCompanyMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:CommonStockMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:DelmarvaPowerandLightCompanyMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:CommonStockMember2024-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:CommonStockMember2024-03-310001109357us-gaap:RetainedEarningsMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:CommonStockMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:DelmarvaPowerandLightCompanyMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:CommonStockMember2023-01-012023-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:CommonStockMember2023-03-310001109357us-gaap:RetainedEarningsMemberexc:DelmarvaPowerandLightCompanyMember2023-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357exc:AtlanticCityElectricCompanyMember2023-12-310001109357exc:AtlanticCityElectricCompanyMember2022-12-310001109357exc:AtlanticCityElectricCompanyMember2023-03-310001109357us-gaap:RelatedPartyMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:NonrelatedPartyMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:NonrelatedPartyMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:CommonStockMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:RetainedEarningsMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:CommonStockMember2024-01-012024-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:CommonStockMember2024-03-310001109357us-gaap:RetainedEarningsMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:CommonStockMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:AtlanticCityElectricCompanyMember2022-12-310001109357us-gaap:RetainedEarningsMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:CommonStockMember2023-01-012023-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:CommonStockMember2023-03-310001109357us-gaap:RetainedEarningsMemberexc:AtlanticCityElectricCompanyMember2023-03-310001109357exc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionBaseRateCaseMember2023-01-172023-01-170001109357exc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionBaseRateCaseMember2023-12-142023-12-14xbrli:pure0001109357exc:Illinois2024ElectricDistributionOrderOnRehearingMemberexc:CommonwealthEdisonCoMember2023-01-172023-01-170001109357exc:Illinois2024ElectricDistributionOrderOnRehearingMemberexc:CommonwealthEdisonCoMemberus-gaap:SubsequentEventMember2024-04-182024-04-180001109357exc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionReconciliationRateCaseMember2023-04-212023-04-210001109357exc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionReconciliationRateCaseMember2023-11-302023-11-300001109357exc:BaltimoreGasAndElectricCompanyMemberexc:Maryland2023ElectricDistributionBaseRateCaseMember2023-02-172023-02-170001109357exc:BaltimoreGasAndElectricCompanyMemberexc:Maryland2023ElectricDistributionBaseRateCaseMember2023-12-142023-12-140001109357exc:BaltimoreGasAndElectricCompanyMemberexc:Maryland2023GasDistributionBaseRateCaseMember2023-02-172023-02-170001109357exc:BaltimoreGasAndElectricCompanyMemberexc:Maryland2023GasDistributionBaseRateCaseMember2023-12-142023-12-140001109357exc:Maryland2020ElectricDistributionBaseRateCaseMemberexc:PotomacElectricPowerCompanyMember2021-03-312021-03-310001109357exc:Maryland2020ElectricDistributionBaseRateCaseMemberexc:PotomacElectricPowerCompanyMember2021-06-282021-06-280001109357exc:DelmarvaPowerandLightCompanyMemberexc:Maryland2022ElectricDistributionBaseRateCaseMember2022-05-192022-05-190001109357exc:DelmarvaPowerandLightCompanyMemberexc:Maryland2022ElectricDistributionBaseRateCaseMember2022-12-142022-12-140001109357exc:Delaware2022ElectricDistributionBaseRateCaseMemberexc:DelmarvaPowerandLightCompanyMember2023-09-292023-09-290001109357exc:Delaware2022ElectricDistributionBaseRateCaseMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:SubsequentEventMember2024-04-182024-04-180001109357exc:NewJersey2023ElectricDistributionBaseRateCaseMemberexc:AtlanticCityElectricCompanyMember2023-08-212023-08-210001109357exc:NewJersey2023ElectricDistributionBaseRateCaseMemberexc:AtlanticCityElectricCompanyMember2023-11-172023-11-170001109357exc:A2024Memberexc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionBaseRateCaseMember2023-12-142023-12-140001109357exc:A2025Memberexc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionBaseRateCaseMember2023-12-142023-12-140001109357exc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionBaseRateCaseMemberexc:A2026Member2023-12-142023-12-140001109357exc:A2027Memberexc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionBaseRateCaseMember2023-12-142023-12-140001109357exc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionBaseRateCaseMembersrt:ScenarioForecastMember2024-01-012027-12-310001109357exc:A2024Memberexc:Illinois2024ElectricDistributionOrderOnRehearingMemberexc:CommonwealthEdisonCoMemberus-gaap:SubsequentEventMember2024-04-182024-04-180001109357exc:Illinois2024ElectricDistributionOrderOnRehearingMemberexc:A2025Memberexc:CommonwealthEdisonCoMemberus-gaap:SubsequentEventMember2024-04-182024-04-180001109357exc:Illinois2024ElectricDistributionOrderOnRehearingMemberexc:CommonwealthEdisonCoMemberexc:A2026Memberus-gaap:SubsequentEventMember2024-04-182024-04-180001109357exc:A2027Memberexc:Illinois2024ElectricDistributionOrderOnRehearingMemberexc:CommonwealthEdisonCoMemberus-gaap:SubsequentEventMember2024-04-182024-04-180001109357exc:A2023Memberexc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionReconciliationRateCaseMember2023-11-302023-11-300001109357exc:A2024Memberexc:BaltimoreGasAndElectricCompanyMemberexc:Maryland2023ElectricDistributionBaseRateCaseMember2023-12-182023-12-180001109357exc:BaltimoreGasAndElectricCompanyMemberexc:A2025Memberexc:Maryland2023ElectricDistributionBaseRateCaseMember2023-12-182023-12-180001109357exc:BaltimoreGasAndElectricCompanyMemberexc:Maryland2023ElectricDistributionBaseRateCaseMemberexc:A2026Member2023-12-182023-12-180001109357exc:A2024Memberexc:BaltimoreGasAndElectricCompanyMemberexc:Maryland2023GasDistributionBaseRateCaseMember2023-12-182023-12-180001109357exc:BaltimoreGasAndElectricCompanyMemberexc:A2025Memberexc:Maryland2023GasDistributionBaseRateCaseMember2023-12-182023-12-180001109357exc:BaltimoreGasAndElectricCompanyMemberexc:A2026Memberexc:Maryland2023GasDistributionBaseRateCaseMember2023-12-182023-12-180001109357exc:BaltimoreGasAndElectricCompanyMemberexc:A2021Memberexc:Maryland2023ElectricDistributionReconciliationRateCaseMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:A2021Memberexc:Maryland2023GasDistributionReconciliationRateCaseMember2024-01-012024-03-310001109357exc:A2022Memberexc:BaltimoreGasAndElectricCompanyMemberexc:Maryland2023ElectricDistributionReconciliationRateCaseMember2024-01-012024-03-310001109357exc:A2022Memberexc:BaltimoreGasAndElectricCompanyMemberexc:Maryland2023GasDistributionReconciliationRateCaseMember2024-01-012024-03-310001109357exc:A2023Memberexc:BaltimoreGasAndElectricCompanyMemberexc:Maryland2023ElectricDistributionReconciliationRateCaseMember2024-01-012024-03-310001109357exc:A2023Memberexc:BaltimoreGasAndElectricCompanyMemberexc:Maryland2023GasDistributionReconciliationRateCaseMember2024-01-012024-03-310001109357exc:A2022Memberexc:Maryland2020ElectricDistributionBaseRateCaseMemberexc:PotomacElectricPowerCompanyMember2021-06-282021-06-280001109357exc:A2023Memberexc:Maryland2020ElectricDistributionBaseRateCaseMemberexc:PotomacElectricPowerCompanyMember2021-06-282021-06-280001109357exc:A2024Memberexc:Maryland2020ElectricDistributionBaseRateCaseMemberexc:PotomacElectricPowerCompanyMember2021-06-282021-06-280001109357exc:A2022Memberexc:Maryland2020ElectricDistributionBaseRateCaseMemberexc:OffsetsMemberexc:PotomacElectricPowerCompanyMember2022-02-232022-02-230001109357exc:A2023Memberexc:DelmarvaPowerandLightCompanyMemberexc:Maryland2022ElectricDistributionBaseRateCaseMember2022-12-142022-12-140001109357exc:A2024Memberexc:DelmarvaPowerandLightCompanyMemberexc:Maryland2022ElectricDistributionBaseRateCaseMember2022-12-142022-12-140001109357exc:A2025Memberexc:DelmarvaPowerandLightCompanyMemberexc:Maryland2022ElectricDistributionBaseRateCaseMember2022-12-142022-12-140001109357exc:A2023Memberexc:NewJersey2023ElectricDistributionBaseRateCaseMemberexc:AtlanticCityElectricCompanyMember2023-11-172023-11-170001109357exc:A2024Memberexc:NewJersey2023ElectricDistributionBaseRateCaseMemberexc:AtlanticCityElectricCompanyMember2023-11-172023-11-170001109357exc:CommonwealthEdisonCoMemberexc:Illinois2024RefiledGridPlanMember2024-03-152024-03-150001109357exc:Illinois2024ElectricDistributionReconciliationRateCaseMemberexc:CommonwealthEdisonCoMemberus-gaap:SubsequentEventMember2024-04-262024-04-260001109357exc:PecoEnergyCoMemberexc:Pennsylvania2024ElectricDistributionBaseRateCaseMember2024-03-282024-03-280001109357exc:Pennsylvania2024NaturalGasDistributionBaseRateCaseMemberexc:PecoEnergyCoMember2024-03-282024-03-280001109357exc:DistrictOfColumbia2023ElectricDistributionBaseRateCaseMemberexc:PotomacElectricPowerCompanyMember2024-02-272024-02-270001109357exc:PepcoMaryland2023ElectricDistributionBaseRateCaseMemberexc:PotomacElectricPowerCompanyMember2024-02-232024-02-230001109357exc:A2024Memberexc:CommonwealthEdisonCoMemberexc:Illinois2024RefiledGridPlanMember2024-03-152024-03-150001109357exc:A2025Memberexc:CommonwealthEdisonCoMemberexc:Illinois2024RefiledGridPlanMember2024-03-152024-03-150001109357exc:CommonwealthEdisonCoMemberexc:Illinois2024RefiledGridPlanMemberexc:A2026Member2024-03-152024-03-150001109357exc:A2027Memberexc:CommonwealthEdisonCoMemberexc:Illinois2024RefiledGridPlanMember2024-03-152024-03-150001109357exc:A2025Memberexc:PecoEnergyCoMemberexc:Pennsylvania2024ElectricDistributionBaseRateCaseMember2024-03-282024-03-280001109357exc:DistrictOfColumbia2023ElectricDistributionBaseRateCaseMemberexc:A2024Memberexc:PotomacElectricPowerCompanyMember2024-02-272024-02-270001109357exc:DistrictOfColumbia2023ElectricDistributionBaseRateCaseMemberexc:A2025Memberexc:PotomacElectricPowerCompanyMember2024-02-272024-02-270001109357exc:DistrictOfColumbia2023ElectricDistributionBaseRateCaseMemberexc:PotomacElectricPowerCompanyMemberexc:A2026Member2024-02-272024-02-270001109357exc:A2024Memberexc:PepcoMaryland2023ElectricDistributionBaseRateCaseMemberexc:PotomacElectricPowerCompanyMember2024-02-232024-02-230001109357exc:PepcoMaryland2023ElectricDistributionBaseRateCaseMemberexc:A2025Memberexc:PotomacElectricPowerCompanyMember2024-02-232024-02-230001109357exc:PepcoMaryland2023ElectricDistributionBaseRateCaseMemberexc:PotomacElectricPowerCompanyMemberexc:A2026Member2024-02-232024-02-230001109357exc:A2027Memberexc:PepcoMaryland2023ElectricDistributionBaseRateCaseMemberexc:PotomacElectricPowerCompanyMember2024-02-232024-02-230001109357exc:A2024TransmissionFormulaRateAnnualUpdateMemberexc:CommonwealthEdisonCoMemberus-gaap:SubsequentEventMember2024-04-242024-04-240001109357exc:BaltimoreGasAndElectricCompanyMemberexc:A2024TransmissionFormulaRateAnnualUpdateMemberus-gaap:SubsequentEventMember2024-04-242024-04-240001109357exc:A2024TransmissionFormulaRateRevenueReductionMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:SubsequentEventMember2024-04-242024-04-240001109357exc:CommonwealthEdisonCoMember2022-02-032022-02-030001109357exc:CommonwealthEdisonCoMembersrt:ScenarioForecastMember2024-01-012027-12-310001109357exc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionBaseRateCaseMember2023-09-272023-09-270001109357exc:A2023Memberexc:CommonwealthEdisonCoMemberexc:Illinois2023ElectricDistributionBaseRateCaseMembersrt:ScenarioForecastMember2024-01-012027-12-310001109357exc:CommonwealthEdisonCoMember2022-09-272022-09-270001109357exc:CarbonMitigationCreditRiderMemberexc:CommonwealthEdisonCoMember2024-03-310001109357exc:CommonwealthEdisonCoMembersrt:ScenarioForecastMember2023-01-012025-12-310001109357exc:AtlanticCityElectricCompanyMember2022-03-310001109357exc:CarbonMitigationCreditRiderMemberexc:CommonwealthEdisonCoMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberexc:NuclearDecommissioningMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:DeferredIncomeTaxChargesMember2024-01-012024-03-310001109357exc:UnderRecoveredRevenueDecouplingMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357exc:EnergyEfficiencyAndDemandResponseProgramsMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:StormCostsMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMember2020-07-01exc:PotomacElectricPowerCompanyMember2020-07-010001109357us-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMember2020-07-01exc:AtlanticCityElectricCompanyMember2020-07-010001109357us-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMember2020-07-01exc:DelmarvaPowerandLightCompanyMember2020-07-010001109357us-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMember2024-01-01exc:PotomacElectricPowerCompanyMember2023-12-310001109357us-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMember2024-01-01exc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMember2024-01-01exc:DelmarvaPowerandLightCompanyMember2023-12-3100011093572024-04-012024-03-310001109357exc:PepcoHoldingsLLCMember2024-04-012024-03-3100011093572024-04-01exc:PotomacElectricPowerCompanyMember2024-03-3100011093572024-04-01exc:DelmarvaPowerandLightCompanyMember2024-03-3100011093572024-04-01exc:AtlanticCityElectricCompanyMember2024-03-3100011093572025-01-012024-03-310001109357exc:PepcoHoldingsLLCMember2025-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMember2025-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMember2025-01-012024-03-310001109357exc:AtlanticCityElectricCompanyMember2025-01-012024-03-3100011093572026-01-012024-03-3100011093572026-01-01exc:PepcoHoldingsLLCMember2024-03-3100011093572026-01-01exc:PotomacElectricPowerCompanyMember2024-03-3100011093572026-01-01exc:DelmarvaPowerandLightCompanyMember2024-03-3100011093572026-01-01exc:AtlanticCityElectricCompanyMember2024-03-3100011093572027-01-012024-03-310001109357exc:PepcoHoldingsLLCMember2027-01-012024-03-3100011093572027-01-01exc:PotomacElectricPowerCompanyMember2024-03-3100011093572027-01-01exc:DelmarvaPowerandLightCompanyMember2024-03-3100011093572027-01-01exc:AtlanticCityElectricCompanyMember2024-03-3100011093572028-01-012024-03-310001109357exc:PepcoHoldingsLLCMember2028-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMember2028-01-012024-03-3100011093572028-01-01exc:DelmarvaPowerandLightCompanyMember2024-03-3100011093572028-01-01exc:AtlanticCityElectricCompanyMember2024-03-31exc:Reportable_segment0001109357exc:CommonwealthEdisonCoMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:CorporateNonSegmentMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:IntersegmentEliminationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:CommonwealthEdisonCoMemberus-gaap:OperatingSegmentsMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:BaltimoreGasAndElectricCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMemberus-gaap:OperatingSegmentsMember2024-01-012024-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:NaturalGasUsRegulatedMemberus-gaap:CorporateNonSegmentMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:IntersegmentEliminationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMemberus-gaap:ServiceOtherMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:ServiceOtherMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMember2024-01-012024-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:ServiceOtherMemberus-gaap:CorporateNonSegmentMember2024-01-012024-03-310001109357us-gaap:IntersegmentEliminationMemberus-gaap:ServiceOtherMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:OperatingSegmentsMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:BaltimoreGasAndElectricCompanyMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:OperatingSegmentsMember2024-01-012024-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:CorporateNonSegmentMember2024-01-012024-03-310001109357us-gaap:IntersegmentEliminationMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:CorporateNonSegmentMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:IntersegmentEliminationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:CommonwealthEdisonCoMemberus-gaap:OperatingSegmentsMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:BaltimoreGasAndElectricCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMemberus-gaap:OperatingSegmentsMember2023-01-012023-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:NaturalGasUsRegulatedMemberus-gaap:CorporateNonSegmentMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:IntersegmentEliminationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMemberus-gaap:ServiceOtherMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:ServiceOtherMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMember2023-01-012023-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:ServiceOtherMemberus-gaap:CorporateNonSegmentMember2023-01-012023-03-310001109357us-gaap:IntersegmentEliminationMemberus-gaap:ServiceOtherMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:OperatingSegmentsMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:BaltimoreGasAndElectricCompanyMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:OperatingSegmentsMember2023-01-012023-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:CorporateNonSegmentMember2023-01-012023-03-310001109357us-gaap:IntersegmentEliminationMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:IntersegmentEliminationMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMemberexc:PecoEnergyCoMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMemberexc:BaltimoreGasAndElectricCompanyMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMember2024-01-012024-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:OperatingSegmentsMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:IntersegmentEliminationMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMemberexc:PecoEnergyCoMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMemberexc:BaltimoreGasAndElectricCompanyMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMember2023-01-012023-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberus-gaap:OperatingSegmentsMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:OperatingSegmentsMember2024-03-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMember2024-03-310001109357us-gaap:OperatingSegmentsMemberexc:BaltimoreGasAndElectricCompanyMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:OperatingSegmentsMember2024-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:CorporateNonSegmentMember2024-03-310001109357us-gaap:IntersegmentEliminationMember2024-03-310001109357us-gaap:OperatingSegmentsMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:OperatingSegmentsMember2023-12-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMember2023-12-310001109357us-gaap:OperatingSegmentsMemberexc:BaltimoreGasAndElectricCompanyMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:OperatingSegmentsMember2023-12-310001109357us-gaap:CorporateAndOtherMemberus-gaap:CorporateNonSegmentMember2023-12-310001109357us-gaap:IntersegmentEliminationMember2023-12-310001109357us-gaap:OperatingSegmentsMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:CorporateAndOtherMemberexc:PepcoHoldingsLLCMemberus-gaap:CorporateNonSegmentMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PotomacElectricPowerCompanyMemberus-gaap:OperatingSegmentsMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:OperatingSegmentsMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMemberus-gaap:CorporateNonSegmentMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMember2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMember2024-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:CorporateAndOtherMemberexc:PepcoHoldingsLLCMemberus-gaap:ServiceOtherMemberus-gaap:CorporateNonSegmentMember2024-01-012024-03-310001109357us-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMemberus-gaap:ServiceOtherMember2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:OperatingSegmentsMember2024-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:OperatingSegmentsMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:CorporateAndOtherMemberexc:PepcoHoldingsLLCMemberus-gaap:CorporateNonSegmentMember2024-01-012024-03-310001109357us-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMember2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:ElectricityUsRegulatedMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:CorporateAndOtherMemberexc:PepcoHoldingsLLCMemberus-gaap:CorporateNonSegmentMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PotomacElectricPowerCompanyMemberus-gaap:OperatingSegmentsMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:OperatingSegmentsMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMemberus-gaap:CorporateNonSegmentMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMember2023-01-012023-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMember2023-01-012023-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:ServiceOtherMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:CorporateAndOtherMemberexc:PepcoHoldingsLLCMemberus-gaap:ServiceOtherMemberus-gaap:CorporateNonSegmentMember2023-01-012023-03-310001109357us-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMemberus-gaap:ServiceOtherMember2023-01-012023-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:OperatingSegmentsMember2023-01-012023-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:OperatingSegmentsMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:CorporateAndOtherMemberexc:PepcoHoldingsLLCMemberus-gaap:CorporateNonSegmentMember2023-01-012023-03-310001109357us-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:PotomacElectricPowerCompanyMemberus-gaap:IntersegmentEliminationMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:IntersegmentEliminationMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:PotomacElectricPowerCompanyMemberus-gaap:IntersegmentEliminationMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:IntersegmentEliminationMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:CorporateAndOtherMemberus-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberus-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMember2023-01-012023-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:OperatingSegmentsMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:OperatingSegmentsMember2024-03-310001109357us-gaap:OperatingSegmentsMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:CorporateAndOtherMemberexc:PepcoHoldingsLLCMemberus-gaap:CorporateNonSegmentMember2024-03-310001109357us-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:OperatingSegmentsMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:OperatingSegmentsMember2023-12-310001109357us-gaap:OperatingSegmentsMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:CorporateAndOtherMemberexc:PepcoHoldingsLLCMemberus-gaap:CorporateNonSegmentMember2023-12-310001109357us-gaap:IntersegmentEliminationMemberexc:PepcoHoldingsLLCMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:SmallCommercialIndustrialMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:SmallCommercialIndustrialMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:SmallCommercialIndustrialMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:LargeCommercialIndustrialMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:LargeCommercialIndustrialMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:LargeCommercialIndustrialMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:OtherMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:OtherMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberexc:OtherMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:OtherMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberexc:OtherMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:OtherMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:OtherMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:ResidentialMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:ResidentialMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberexc:ResidentialMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:ResidentialMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberexc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberexc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberexc:TransportationMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:OtherMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:OtherMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberexc:OtherMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:OtherMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberexc:OtherMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:OtherMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:OtherMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberexc:AlternativeRevenueProgramsMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberexc:OtherRegulatedRevenueMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberexc:OtherRegulatedRevenueMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:OtherRegulatedRevenueMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberexc:OtherRegulatedRevenueMember2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMemberexc:OtherRegulatedRevenueMember2024-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberexc:OtherRegulatedRevenueMember2024-01-012024-03-310001109357exc:AtlanticCityElectricCompanyMemberexc:OtherRegulatedRevenueMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:SmallCommercialIndustrialMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:SmallCommercialIndustrialMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:SmallCommercialIndustrialMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:LargeCommercialIndustrialMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:LargeCommercialIndustrialMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:LargeCommercialIndustrialMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberexc:PublicAuthoritiesElectricRailroadsMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:OtherMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:OtherMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberexc:OtherMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:OtherMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberexc:OtherMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:OtherMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:OtherMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:ResidentialMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:ResidentialMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberexc:ResidentialMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:ResidentialMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:ResidentialMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberexc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:SmallCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberexc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:LargeCommercialIndustrialMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberexc:TransportationMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:TransportationMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:OtherMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:OtherMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMemberexc:OtherMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:OtherMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberexc:OtherMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:OtherMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:OtherMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357us-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberexc:AlternativeRevenueProgramsMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:AlternativeRevenueProgramsMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:OperatingSegmentsMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberexc:OtherRegulatedRevenueMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberexc:OtherRegulatedRevenueMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:OtherRegulatedRevenueMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberexc:OtherRegulatedRevenueMember2023-01-012023-03-310001109357exc:PotomacElectricPowerCompanyMemberexc:OtherRegulatedRevenueMember2023-01-012023-03-310001109357exc:DelmarvaPowerandLightCompanyMemberexc:OtherRegulatedRevenueMember2023-01-012023-03-310001109357exc:AtlanticCityElectricCompanyMemberexc:OtherRegulatedRevenueMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RelatedPartyMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:RelatedPartyMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberexc:PepcoHoldingsLLCMemberus-gaap:RegulatedOperationMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:RegulatedOperationMemberexc:PotomacElectricPowerCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:RegulatedOperationMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:RelatedPartyMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2024-01-012024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:RegulatedOperationMemberexc:AtlanticCityElectricCompanyMemberus-gaap:ElectricityUsRegulatedMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberus-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:RelatedPartyMemberus-gaap:RegulatedOperationMember2024-01-012024-03-310001109357us-gaap:NaturalGasUsRegulatedMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:RelatedPartyMemberus-gaap:RegulatedOperationMember2023-01-012023-03-310001109357us-gaap:TradeAccountsReceivableMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:TradeAccountsReceivableMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:TradeAccountsReceivableMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:TradeAccountsReceivableMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:TradeAccountsReceivableMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:TradeAccountsReceivableMember2023-12-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2023-12-310001109357us-gaap:TradeAccountsReceivableMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:TradeAccountsReceivableMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberus-gaap:TradeAccountsReceivableMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:TradeAccountsReceivableMember2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:TradeAccountsReceivableMember2024-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:TradeAccountsReceivableMember2024-01-012024-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2024-01-012024-03-310001109357us-gaap:TradeAccountsReceivableMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:TradeAccountsReceivableMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:TradeAccountsReceivableMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:TradeAccountsReceivableMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:TradeAccountsReceivableMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:TradeAccountsReceivableMember2024-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2024-03-310001109357us-gaap:TradeAccountsReceivableMember2022-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:TradeAccountsReceivableMember2022-12-310001109357exc:PecoEnergyCoMemberus-gaap:TradeAccountsReceivableMember2022-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2022-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:TradeAccountsReceivableMember2022-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:TradeAccountsReceivableMember2022-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:TradeAccountsReceivableMember2022-12-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2022-12-310001109357us-gaap:TradeAccountsReceivableMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:TradeAccountsReceivableMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberus-gaap:TradeAccountsReceivableMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:TradeAccountsReceivableMember2023-01-012023-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:TradeAccountsReceivableMember2023-01-012023-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:TradeAccountsReceivableMember2023-01-012023-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2023-01-012023-03-310001109357us-gaap:TradeAccountsReceivableMember2023-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:TradeAccountsReceivableMember2023-03-310001109357exc:PecoEnergyCoMemberus-gaap:TradeAccountsReceivableMember2023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2023-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:TradeAccountsReceivableMember2023-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:TradeAccountsReceivableMember2023-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:TradeAccountsReceivableMember2023-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:TradeAccountsReceivableMember2023-03-310001109357exc:OtherReceivablesMember2023-12-310001109357exc:CommonwealthEdisonCoMemberexc:OtherReceivablesMember2023-12-310001109357exc:PecoEnergyCoMemberexc:OtherReceivablesMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:OtherReceivablesMember2023-12-310001109357exc:PepcoHoldingsLLCMemberexc:OtherReceivablesMember2023-12-310001109357exc:OtherReceivablesMemberexc:PotomacElectricPowerCompanyMember2023-12-310001109357exc:OtherReceivablesMemberexc:DelmarvaPowerandLightCompanyMember2023-12-310001109357exc:OtherReceivablesMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357exc:OtherReceivablesMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberexc:OtherReceivablesMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberexc:OtherReceivablesMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:OtherReceivablesMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberexc:OtherReceivablesMember2024-01-012024-03-310001109357exc:OtherReceivablesMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357exc:OtherReceivablesMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357exc:OtherReceivablesMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357exc:OtherReceivablesMember2024-03-310001109357exc:CommonwealthEdisonCoMemberexc:OtherReceivablesMember2024-03-310001109357exc:PecoEnergyCoMemberexc:OtherReceivablesMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:OtherReceivablesMember2024-03-310001109357exc:PepcoHoldingsLLCMemberexc:OtherReceivablesMember2024-03-310001109357exc:OtherReceivablesMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357exc:OtherReceivablesMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357exc:OtherReceivablesMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357exc:OtherReceivablesMember2022-12-310001109357exc:CommonwealthEdisonCoMemberexc:OtherReceivablesMember2022-12-310001109357exc:PecoEnergyCoMemberexc:OtherReceivablesMember2022-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:OtherReceivablesMember2022-12-310001109357exc:PepcoHoldingsLLCMemberexc:OtherReceivablesMember2022-12-310001109357exc:OtherReceivablesMemberexc:PotomacElectricPowerCompanyMember2022-12-310001109357exc:OtherReceivablesMemberexc:DelmarvaPowerandLightCompanyMember2022-12-310001109357exc:OtherReceivablesMemberexc:AtlanticCityElectricCompanyMember2022-12-310001109357exc:OtherReceivablesMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberexc:OtherReceivablesMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberexc:OtherReceivablesMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:OtherReceivablesMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberexc:OtherReceivablesMember2023-01-012023-03-310001109357exc:OtherReceivablesMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357exc:OtherReceivablesMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357exc:OtherReceivablesMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357exc:OtherReceivablesMember2023-03-310001109357exc:CommonwealthEdisonCoMemberexc:OtherReceivablesMember2023-03-310001109357exc:PecoEnergyCoMemberexc:OtherReceivablesMember2023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:OtherReceivablesMember2023-03-310001109357exc:PepcoHoldingsLLCMemberexc:OtherReceivablesMember2023-03-310001109357exc:OtherReceivablesMemberexc:PotomacElectricPowerCompanyMember2023-03-310001109357exc:OtherReceivablesMemberexc:DelmarvaPowerandLightCompanyMember2023-03-310001109357exc:OtherReceivablesMemberexc:AtlanticCityElectricCompanyMember2023-03-310001109357exc:ConstellationEnergyCorpMember2024-03-310001109357exc:ConstellationEnergyCorpMember2023-12-310001109357exc:DeferredCostsAndOtherAssetsMember2023-12-310001109357exc:DeferredCostsAndOtherAssetsMember2024-03-310001109357us-gaap:UsTreasuryUstInterestRateMember2022-08-162022-08-160001109357us-gaap:PensionPlansDefinedBenefitMember2024-01-012024-03-310001109357us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2024-01-012024-03-310001109357us-gaap:PensionPlansDefinedBenefitMember2023-01-012023-03-310001109357us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-03-310001109357exc:PensionandotherpostretirementbenefitMember2024-01-012024-03-310001109357exc:PensionandotherpostretirementbenefitMember2023-01-012023-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:CommonwealthEdisonCoMember2024-01-012024-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:CommonwealthEdisonCoMember2023-01-012023-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:PecoEnergyCoMember2024-01-012024-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:PecoEnergyCoMember2023-01-012023-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:BaltimoreGasAndElectricCompanyMember2024-01-012024-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:BaltimoreGasAndElectricCompanyMember2023-01-012023-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:PepcoHoldingsLLCMember2024-01-012024-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:PepcoHoldingsLLCMember2023-01-012023-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357exc:PensionandotherpostretirementbenefitMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMember2012-06-012012-06-30utr:MWh0001109357exc:BaltimoreGasAndElectricCompanyMembersrt:MinimumMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMembersrt:MaximumMember2024-01-012024-03-310001109357us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMember2024-03-310001109357us-gaap:NondesignatedMemberus-gaap:InterestRateContractMember2024-03-310001109357us-gaap:InterestRateContractMember2024-03-310001109357us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMember2023-12-310001109357us-gaap:NondesignatedMemberus-gaap:InterestRateContractMember2023-12-310001109357us-gaap:InterestRateContractMember2023-12-310001109357exc:InterestRateSwapTerminatedMemberus-gaap:CashFlowHedgingMember2024-02-290001109357us-gaap:NotesPayableToBanksMemberus-gaap:CorporateNonSegmentMember2024-02-290001109357us-gaap:NotesPayableToBanksMemberus-gaap:CorporateNonSegmentMember2024-02-012024-02-290001109357exc:InterestRateSwapTerminatedMemberus-gaap:CashFlowHedgingMember2024-03-310001109357us-gaap:CashFlowHedgingMemberexc:InterestRateSwapNotional5YRMember2024-03-310001109357exc:InterestRateSwapNotional10YRMemberus-gaap:CashFlowHedgingMember2024-03-310001109357us-gaap:InterestRateSwapMemberus-gaap:CashFlowHedgingMember2024-03-310001109357us-gaap:CashFlowHedgingMemberexc:InterestRateSwapNotional5YRMember2023-12-310001109357exc:InterestRateSwapNotional10YRMemberus-gaap:CashFlowHedgingMember2023-12-310001109357us-gaap:InterestRateSwapMemberus-gaap:CashFlowHedgingMember2023-12-310001109357us-gaap:NondesignatedMemberus-gaap:InterestRateCapMember2023-12-310001109357us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberexc:ConstantMaturityTreasuryInterestRateSwapsMemberexc:A2023Member2023-12-310001109357us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberexc:ConstantMaturityTreasuryInterestRateSwapsMember2023-12-310001109357us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberexc:ElectricOperatingRevenuesMemberus-gaap:InterestRateCapMember2024-01-012024-03-310001109357us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberexc:ElectricOperatingRevenuesMemberus-gaap:InterestRateCapMember2023-01-012023-03-310001109357us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberus-gaap:InterestExpenseMemberus-gaap:InterestRateCapMember2024-01-012024-03-310001109357us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberus-gaap:InterestExpenseMemberus-gaap:InterestRateCapMember2023-01-012023-03-310001109357us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberus-gaap:InterestRateCapMember2024-01-012024-03-310001109357us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberus-gaap:InterestRateCapMember2023-01-012023-03-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberus-gaap:CommodityContractMember2024-03-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberus-gaap:CommodityContractMember2023-12-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberexc:CommonwealthEdisonCoMemberus-gaap:CommodityContractMember2024-03-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberexc:CommonwealthEdisonCoMemberus-gaap:CommodityContractMember2023-12-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberexc:PecoEnergyCoMemberus-gaap:CommodityContractMember2024-03-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberexc:PecoEnergyCoMemberus-gaap:CommodityContractMember2023-12-310001109357exc:ExternalCounterpartiesMemberexc:BaltimoreGasAndElectricCompanyMemberexc:CollateralMemberus-gaap:CommodityContractMember2024-03-310001109357exc:ExternalCounterpartiesMemberexc:BaltimoreGasAndElectricCompanyMemberexc:CollateralMemberus-gaap:CommodityContractMember2023-12-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberexc:PepcoHoldingsLLCMemberus-gaap:CommodityContractMember2024-03-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberexc:PepcoHoldingsLLCMemberus-gaap:CommodityContractMember2023-12-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberexc:PotomacElectricPowerCompanyMemberus-gaap:CommodityContractMember2024-03-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberexc:PotomacElectricPowerCompanyMemberus-gaap:CommodityContractMember2023-12-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberus-gaap:CommodityContractMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberus-gaap:CommodityContractMemberexc:DelmarvaPowerandLightCompanyMember2023-12-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberus-gaap:CommodityContractMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357exc:ExternalCounterpartiesMemberexc:CollateralMemberus-gaap:CommodityContractMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:CommercialPaperMember2024-03-310001109357us-gaap:CommercialPaperMember2023-12-310001109357us-gaap:CommercialPaperMemberexc:CommonwealthEdisonCoMember2024-03-310001109357us-gaap:CommercialPaperMemberexc:CommonwealthEdisonCoMember2023-12-310001109357us-gaap:CommercialPaperMemberexc:PecoEnergyCoMember2024-03-310001109357us-gaap:CommercialPaperMemberexc:PecoEnergyCoMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:CommercialPaperMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:CommercialPaperMember2023-12-310001109357us-gaap:CommercialPaperMemberexc:PepcoHoldingsLLCMember2024-03-310001109357us-gaap:CommercialPaperMemberexc:PepcoHoldingsLLCMember2023-12-310001109357us-gaap:CommercialPaperMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357us-gaap:CommercialPaperMemberexc:PotomacElectricPowerCompanyMember2023-12-310001109357us-gaap:CommercialPaperMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357us-gaap:CommercialPaperMemberexc:DelmarvaPowerandLightCompanyMember2023-12-310001109357us-gaap:CommercialPaperMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:CommercialPaperMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:CommercialPaperMemberus-gaap:CorporateNonSegmentMember2024-03-310001109357us-gaap:CommercialPaperMemberus-gaap:CorporateNonSegmentMember2023-12-310001109357us-gaap:RevolvingCreditFacilityMemberus-gaap:CorporateNonSegmentMember2024-01-012024-03-310001109357us-gaap:RevolvingCreditFacilityMemberus-gaap:CorporateNonSegmentMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberus-gaap:CorporateNonSegmentMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:CommonwealthEdisonCoMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberexc:CommonwealthEdisonCoMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:PecoEnergyCoMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberexc:PecoEnergyCoMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:BaltimoreGasAndElectricCompanyMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:BaltimoreGasAndElectricCompanyMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:BaltimoreGasAndElectricCompanyMember2024-01-012024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:CommonwealthEdisonCoMember2024-01-012024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:PecoEnergyCoMember2024-01-012024-03-310001109357us-gaap:RevolvingCreditFacilityMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357us-gaap:LetterOfCreditMemberexc:CommonwealthEdisonCoMember2022-10-070001109357us-gaap:LetterOfCreditMemberexc:PecoEnergyCoMember2022-10-070001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:LetterOfCreditMember2022-10-070001109357us-gaap:LetterOfCreditMemberexc:PotomacElectricPowerCompanyMember2022-10-070001109357us-gaap:LetterOfCreditMemberexc:DelmarvaPowerandLightCompanyMember2022-10-070001109357us-gaap:LetterOfCreditMemberexc:AtlanticCityElectricCompanyMember2022-10-070001109357exc:ShortTermDebt03232017Memberus-gaap:CorporateNonSegmentMember2017-03-230001109357exc:ShortTermDebt2amend03142024Memberus-gaap:CorporateNonSegmentMember2024-03-140001109357exc:ShortTermDebt7Amend03142024Memberus-gaap:CorporateNonSegmentMember2024-03-140001109357exc:ShortTermDebt7Amend03142024Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberus-gaap:CorporateNonSegmentMember2024-01-012024-03-310001109357us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberexc:ShortTermDebt2amend03142024Memberus-gaap:CorporateNonSegmentMember2024-01-012024-03-310001109357exc:ShortTermDebtSOFRplus100May72024Memberexc:CommonwealthEdisonCoMember2023-05-090001109357exc:ShortTermDebtSOFRplus100May72024Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberexc:CommonwealthEdisonCoMember2023-05-092023-05-090001109357exc:CommonwealthEdisonCoMemberexc:ShortTermDebtSOFRplus100June282024Memberus-gaap:SubsequentEventMember2024-05-010001109357us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberexc:CommonwealthEdisonCoMemberexc:ShortTermDebtSOFRplus100June282024Memberus-gaap:SubsequentEventMember2024-05-012024-05-010001109357exc:Notes515DueMar2029Memberus-gaap:NotesPayableToBanksMemberus-gaap:CorporateNonSegmentMember2024-03-310001109357us-gaap:NotesPayableToBanksMemberexc:Notes545DueMar2034Memberus-gaap:CorporateNonSegmentMember2024-03-310001109357us-gaap:NotesPayableToBanksMemberexc:Notes560DueMar2053Memberus-gaap:CorporateNonSegmentMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberexc:Notes520DueMar2034Memberexc:FirstMortgageBondsMember2024-03-310001109357exc:Notes550DueMar2054Memberexc:PotomacElectricPowerCompanyMemberexc:FirstMortgageBondsMember2024-03-310001109357exc:Notes524DueMar2034Memberexc:DelmarvaPowerandLightCompanyMemberexc:FirstMortgageBondsMember2024-03-310001109357exc:Notes555DueMar2054Memberexc:DelmarvaPowerandLightCompanyMemberexc:FirstMortgageBondsMember2024-03-310001109357exc:Notes555DueMar2054Memberexc:AtlanticCityElectricCompanyMemberexc:FirstMortgageBondsMember2024-03-310001109357exc:Notes529DueAug2034Memberexc:AtlanticCityElectricCompanyMemberexc:FirstMortgageBondsMember2024-03-200001109357exc:Notes549DueAug2039Memberexc:AtlanticCityElectricCompanyMemberexc:FirstMortgageBondsMember2024-03-200001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:FairValueInputsLevel1Memberexc:AtlanticCityElectricCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:FairValueInputsLevel1Memberexc:AtlanticCityElectricCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001109357us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001109357us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:CarryingReportedAmountFairValueDisclosureMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:CarryingReportedAmountFairValueDisclosureMemberexc:PotomacElectricPowerCompanyMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:CarryingReportedAmountFairValueDisclosureMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:CarryingReportedAmountFairValueDisclosureMemberexc:DelmarvaPowerandLightCompanyMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:CarryingReportedAmountFairValueDisclosureMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:FairValueInputsLevel3Memberexc:AtlanticCityElectricCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:CarryingReportedAmountFairValueDisclosureMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:FairValueInputsLevel3Memberexc:AtlanticCityElectricCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:AtlanticCityElectricCompanyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberexc:CommonwealthEdisonCoMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357us-gaap:RelatedPartyMemberexc:PecoEnergyCoMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MutualFundMember2024-03-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MutualFundMember2023-12-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357us-gaap:FixedIncomeInvestmentsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:FixedIncomeInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357us-gaap:FixedIncomeInvestmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:FixedIncomeInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:FixedIncomeInvestmentsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:FixedIncomeInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357us-gaap:FixedIncomeInvestmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:FixedIncomeInvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357sic:Z6311us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311us-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357sic:Z6311us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311us-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2024-03-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2023-12-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DesignatedAsHedgingInstrumentMember2024-03-310001109357us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DesignatedAsHedgingInstrumentMember2023-12-310001109357exc:EconomicHedgesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:EconomicHedgesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357exc:EconomicHedgesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:EconomicHedgesMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:EconomicHedgesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:EconomicHedgesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357exc:EconomicHedgesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:EconomicHedgesMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:InterestRateDerivativeAssetsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:InterestRateDerivativeAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357exc:InterestRateDerivativeAssetsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:InterestRateDerivativeAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:InterestRateDerivativeAssetsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:InterestRateDerivativeAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357exc:InterestRateDerivativeAssetsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:InterestRateDerivativeAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:MarkToMarketDerivativeLiabilitiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:MarkToMarketDerivativeLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357exc:MarkToMarketDerivativeLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:MarkToMarketDerivativeLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:MarkToMarketDerivativeLiabilitiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:MarkToMarketDerivativeLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357exc:MarkToMarketDerivativeLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:MarkToMarketDerivativeLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:DerivativesDesignatedAsHedgingInstrumentsLiabilitiesMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:DerivativesDesignatedAsHedgingInstrumentsLiabilitiesMember2024-03-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:DerivativesDesignatedAsHedgingInstrumentsLiabilitiesMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:DerivativesDesignatedAsHedgingInstrumentsLiabilitiesMember2024-03-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:DerivativesDesignatedAsHedgingInstrumentsLiabilitiesMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:DerivativesDesignatedAsHedgingInstrumentsLiabilitiesMember2023-12-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:DerivativesDesignatedAsHedgingInstrumentsLiabilitiesMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:DerivativesDesignatedAsHedgingInstrumentsLiabilitiesMember2023-12-310001109357exc:EconomicHedgingInstrumentLiabilitesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:EconomicHedgingInstrumentLiabilitesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357exc:EconomicHedgingInstrumentLiabilitesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:EconomicHedgingInstrumentLiabilitesMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:EconomicHedgingInstrumentLiabilitesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:EconomicHedgingInstrumentLiabilitesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357exc:EconomicHedgingInstrumentLiabilitesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:EconomicHedgingInstrumentLiabilitesMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:InterestRateDerivativeLiabilitiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:InterestRateDerivativeLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357exc:InterestRateDerivativeLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:InterestRateDerivativeLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:InterestRateDerivativeLiabilitiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:InterestRateDerivativeLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357exc:InterestRateDerivativeLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:InterestRateDerivativeLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CashAndCashEquivalentsMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CashAndCashEquivalentsMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:RestrictedcashMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:RestrictedcashMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherAssetsMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherAssetsMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MutualFundMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MutualFundMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MutualFundMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357sic:Z6311exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357sic:Z6311exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357sic:Z6311exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357sic:Z6311exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MutualFundMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MutualFundMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MutualFundMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357sic:Z6311exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357sic:Z6311exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357sic:Z6311exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357sic:Z6311exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RestrictedcashMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RestrictedcashMember2023-12-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherAssetsMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherAssetsMember2023-12-310001109357exc:PecoEnergyCoMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RestrictedcashMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RestrictedcashMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357us-gaap:CashEquivalentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357us-gaap:CashEquivalentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MutualFundMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:MutualFundMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MutualFundMember2023-12-310001109357us-gaap:FixedIncomeInvestmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:FixedIncomeInvestmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357us-gaap:FixedIncomeInvestmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:FixedIncomeInvestmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:FixedIncomeInvestmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:FixedIncomeInvestmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357us-gaap:FixedIncomeInvestmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:FixedIncomeInvestmentsMemberexc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:CashEquivalentsMemberexc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberexc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357us-gaap:CashEquivalentsMemberexc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberexc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357us-gaap:CashEquivalentsMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357sic:Z6311exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357sic:Z6311us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357sic:Z6311us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberus-gaap:FairValueInputsLevel2Member2024-03-310001109357sic:Z6311us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357sic:Z6311us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2024-03-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberexc:RabbiTrustInvestmentsMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:CashEquivalentsMemberexc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberexc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357us-gaap:CashEquivalentsMemberexc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberexc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357us-gaap:CashEquivalentsMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberexc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:CashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357sic:Z6311exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357sic:Z6311us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357sic:Z6311us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberus-gaap:FairValueInputsLevel2Member2023-12-310001109357sic:Z6311us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357sic:Z6311us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberus-gaap:FairValueInputsLevel2Memberexc:RabbiTrustInvestmentsMember2023-12-310001109357us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357us-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMemberexc:RabbiTrustInvestmentsMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RestrictedcashMember2024-03-310001109357exc:PepcoHoldingsLLCMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RestrictedcashMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RestrictedcashMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueMeasurementsRecurringMemberexc:RestrictedcashMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001109357us-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueMeasurementsRecurringMemberexc:AtlanticCityElectricCompanyMember2023-12-310001109357us-gaap:FairValueInputsLevel3Member2023-12-310001109357us-gaap:DerivativeMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Member2023-12-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2023-12-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Member2023-12-310001109357us-gaap:FairValueInputsLevel3Member2024-01-012024-03-310001109357us-gaap:DerivativeMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Member2024-01-012024-03-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Member2024-01-012024-03-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2024-01-012024-03-310001109357us-gaap:FairValueInputsLevel3Member2024-03-310001109357us-gaap:DerivativeMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Member2024-03-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Member2024-03-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2024-03-310001109357us-gaap:FairValueInputsLevel3Member2022-12-310001109357us-gaap:DerivativeMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Member2022-12-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2022-12-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Member2022-12-310001109357us-gaap:FairValueInputsLevel3Member2023-01-012023-03-310001109357us-gaap:DerivativeMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Member2023-01-012023-03-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2023-01-012023-03-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Member2023-01-012023-03-310001109357us-gaap:FairValueInputsLevel3Member2023-03-310001109357us-gaap:DerivativeMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Member2023-03-310001109357sic:Z6311exc:PepcoHoldingsLLCMemberus-gaap:FairValueInputsLevel3Member2023-03-310001109357sic:Z6311exc:PotomacElectricPowerCompanyMemberus-gaap:FairValueInputsLevel3Member2023-03-310001109357us-gaap:InterestRateSwapMemberus-gaap:DerivativeMemberexc:CommonwealthEdisonCoMember2024-01-012024-03-310001109357us-gaap:InterestRateSwapMemberus-gaap:DerivativeMemberexc:CommonwealthEdisonCoMember2023-01-012023-03-310001109357us-gaap:DerivativeMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Member2024-03-310001109357us-gaap:DerivativeMemberus-gaap:FairValueInputsLevel3Member2024-03-310001109357us-gaap:DerivativeMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Member2023-12-310001109357us-gaap:DerivativeMemberus-gaap:FairValueInputsLevel3Member2023-12-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMemberexc:CommonwealthEdisonCoMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Member2024-03-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Member2024-03-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMember2024-03-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMember2024-03-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMembersrt:ArithmeticAverageMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Member2024-03-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Member2024-03-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMemberexc:CommonwealthEdisonCoMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Member2023-12-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Member2023-12-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMember2023-12-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMember2023-12-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMembersrt:ArithmeticAverageMemberexc:CommonwealthEdisonCoMemberus-gaap:FairValueInputsLevel3Member2023-12-310001109357us-gaap:DerivativeMemberus-gaap:IncomeApproachValuationTechniqueMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Member2023-12-310001109357exc:PEPCOHoldingsIncMember2024-03-310001109357exc:PEPCOHoldingsIncMemberexc:PepcoHoldingsLLCMember2024-03-310001109357exc:PEPCOHoldingsIncMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357exc:PEPCOHoldingsIncMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357exc:PEPCOHoldingsIncMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357exc:PEPCOHoldingsIncMemberexc:RemainingCommitmentMember2024-03-310001109357exc:PEPCOHoldingsIncMemberexc:RemainingCommitmentMemberexc:PepcoHoldingsLLCMember2024-03-310001109357exc:PEPCOHoldingsIncMemberexc:RemainingCommitmentMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357exc:PEPCOHoldingsIncMemberexc:RemainingCommitmentMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357exc:PEPCOHoldingsIncMemberexc:RemainingCommitmentMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:FinancialStandbyLetterOfCreditMember2024-03-310001109357us-gaap:SuretyBondMember2024-03-310001109357us-gaap:GuaranteeOfIndebtednessOfOthersMember2024-03-310001109357us-gaap:GuaranteeObligationsMember2024-03-310001109357us-gaap:FinancialStandbyLetterOfCreditMemberexc:CommonwealthEdisonCoMember2024-03-310001109357us-gaap:SuretyBondMemberexc:CommonwealthEdisonCoMember2024-03-310001109357exc:CommonwealthEdisonCoMemberus-gaap:GuaranteeOfIndebtednessOfOthersMember2024-03-310001109357us-gaap:FinancialStandbyLetterOfCreditMemberexc:PecoEnergyCoMember2024-03-310001109357us-gaap:SuretyBondMemberexc:PecoEnergyCoMember2024-03-310001109357exc:PecoEnergyCoMemberus-gaap:GuaranteeOfIndebtednessOfOthersMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:FinancialStandbyLetterOfCreditMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberus-gaap:SuretyBondMember2024-03-310001109357us-gaap:SuretyBondMemberexc:PepcoHoldingsLLCMember2024-03-310001109357us-gaap:GuaranteeObligationsMemberexc:PepcoHoldingsLLCMember2024-03-310001109357us-gaap:SuretyBondMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357us-gaap:GuaranteeObligationsMemberexc:PotomacElectricPowerCompanyMember2024-03-310001109357us-gaap:SuretyBondMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357us-gaap:GuaranteeObligationsMemberexc:DelmarvaPowerandLightCompanyMember2024-03-310001109357us-gaap:SuretyBondMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:GuaranteeObligationsMemberexc:AtlanticCityElectricCompanyMember2024-03-310001109357us-gaap:GuaranteeObligationsMembersrt:MinimumMember2024-03-310001109357us-gaap:GuaranteeObligationsMembersrt:MaximumMember2024-03-31exc:mGPSite0001109357exc:AccrualForMgpInvestigationAndRemediationMember2024-03-310001109357exc:AccrualForMgpInvestigationAndRemediationMember2023-12-310001109357exc:CommonwealthEdisonCoMemberexc:AccrualForMgpInvestigationAndRemediationMember2024-03-310001109357exc:CommonwealthEdisonCoMemberexc:AccrualForMgpInvestigationAndRemediationMember2023-12-310001109357exc:PecoEnergyCoMemberexc:AccrualForMgpInvestigationAndRemediationMember2024-03-310001109357exc:PecoEnergyCoMemberexc:AccrualForMgpInvestigationAndRemediationMember2023-12-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:AccrualForMgpInvestigationAndRemediationMember2024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:AccrualForMgpInvestigationAndRemediationMember2023-12-310001109357exc:PepcoHoldingsLLCMemberexc:AccrualForMgpInvestigationAndRemediationMember2024-03-310001109357exc:PepcoHoldingsLLCMemberexc:AccrualForMgpInvestigationAndRemediationMember2023-12-310001109357exc:PotomacElectricPowerCompanyMemberexc:AccrualForMgpInvestigationAndRemediationMember2024-03-310001109357exc:PotomacElectricPowerCompanyMemberexc:AccrualForMgpInvestigationAndRemediationMember2023-12-310001109357exc:DelmarvaPowerandLightCompanyMemberexc:AccrualForMgpInvestigationAndRemediationMember2024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberexc:AccrualForMgpInvestigationAndRemediationMember2023-12-310001109357exc:AtlanticCityElectricCompanyMemberexc:AccrualForMgpInvestigationAndRemediationMember2024-03-310001109357exc:AtlanticCityElectricCompanyMemberexc:AccrualForMgpInvestigationAndRemediationMember2023-12-310001109357exc:CommonwealthEdisonCoMember2020-11-012020-11-300001109357exc:ExelonBusinessServicesCoAffiliateMember2024-03-310001109357exc:IllinoisChamberOfCommerceMemberexc:CommonwealthEdisonCoMember2024-03-310001109357us-gaap:CommonStockMember2022-08-040001109357exc:EquityDistributionAgreementMember2023-11-062023-12-060001109357exc:EquityDistributionAgreementMember2023-12-060001109357us-gaap:CommonStockMember2024-03-310001109357us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-12-310001109357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-12-310001109357us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2024-01-012024-03-310001109357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2024-01-012024-03-310001109357us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2024-03-310001109357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2024-03-310001109357us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-12-310001109357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-12-310001109357us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-01-012023-03-310001109357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-01-012023-03-310001109357us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-03-310001109357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-03-310001109357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2024-01-012024-03-310001109357us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2023-01-012023-03-310001109357exc:OtherNonCashActivityMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberexc:OtherNonCashActivityMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberexc:OtherNonCashActivityMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:OtherNonCashActivityMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMemberexc:OtherNonCashActivityMember2024-01-012024-03-310001109357exc:PotomacElectricPowerCompanyMemberexc:OtherNonCashActivityMember2024-01-012024-03-310001109357exc:DelmarvaPowerandLightCompanyMemberexc:OtherNonCashActivityMember2024-01-012024-03-310001109357exc:AtlanticCityElectricCompanyMemberexc:OtherNonCashActivityMember2024-01-012024-03-310001109357exc:ReturnOnBorrowedFundsMember2024-01-012024-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:CommonwealthEdisonCoMember2024-01-012024-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:PecoEnergyCoMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:ReturnOnBorrowedFundsMember2024-01-012024-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:PepcoHoldingsLLCMember2024-01-012024-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:PotomacElectricPowerCompanyMember2024-01-012024-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:DelmarvaPowerandLightCompanyMember2024-01-012024-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:AtlanticCityElectricCompanyMember2024-01-012024-03-310001109357exc:OtherNonCashActivityMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberexc:OtherNonCashActivityMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberexc:OtherNonCashActivityMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:OtherNonCashActivityMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberexc:OtherNonCashActivityMember2023-01-012023-03-310001109357exc:PotomacElectricPowerCompanyMemberexc:OtherNonCashActivityMember2023-01-012023-03-310001109357exc:DelmarvaPowerandLightCompanyMemberexc:OtherNonCashActivityMember2023-01-012023-03-310001109357exc:AtlanticCityElectricCompanyMemberexc:OtherNonCashActivityMember2023-01-012023-03-310001109357exc:ReturnOnBorrowedFundsMember2023-01-012023-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:CommonwealthEdisonCoMember2023-01-012023-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:PecoEnergyCoMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:ReturnOnBorrowedFundsMember2023-01-012023-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:PepcoHoldingsLLCMember2023-01-012023-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:PotomacElectricPowerCompanyMember2023-01-012023-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:DelmarvaPowerandLightCompanyMember2023-01-012023-03-310001109357exc:ReturnOnBorrowedFundsMemberexc:AtlanticCityElectricCompanyMember2023-01-012023-03-310001109357exc:ExelonBusinessServicesCoAffiliateMember2024-01-012024-03-310001109357exc:ExelonBusinessServicesCoAffiliateMember2023-01-012023-03-310001109357exc:PHIServiceCoAffiliateMember2024-01-012024-03-310001109357exc:PHIServiceCoAffiliateMember2023-01-012023-03-310001109357exc:CommonwealthEdisonCoMemberexc:ExelonBusinessServicesCoAffiliateMember2024-01-012024-03-310001109357exc:CommonwealthEdisonCoMemberexc:ExelonBusinessServicesCoAffiliateMember2023-01-012023-03-310001109357exc:PecoEnergyCoMemberexc:ExelonBusinessServicesCoAffiliateMember2024-01-012024-03-310001109357exc:PecoEnergyCoMemberexc:ExelonBusinessServicesCoAffiliateMember2023-01-012023-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:ExelonBusinessServicesCoAffiliateMember2024-01-012024-03-310001109357exc:BaltimoreGasAndElectricCompanyMemberexc:ExelonBusinessServicesCoAffiliateMember2023-01-012023-03-310001109357exc:PepcoHoldingsLLCMemberexc:ExelonBusinessServicesCoAffiliateMember2024-01-012024-03-310001109357exc:PepcoHoldingsLLCMember