Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross	$ (1,434)	$ (1,434)
Accumulated Amortization	1,409	1,227
Net	(25)	(207)
Unamortized Energy Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	(1,515)	(1,515)
Accumulated Amortization	1,470	1,280
Net	(45)	(235)
Business Services Company [Member] | Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	81	81
Accumulated Amortization	(61)	(53)
Net	20	28
Pepco Holdings LLC [Member] | Unamortized Energy Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	(1,515)	(1,515)
Accumulated Amortization	1,470	1,280
Net	$ (45)	$ (235)