Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Mar. 24, 2016	Oct. 20, 2000
Goodwill [Line Items]
Goodwill	$ 6,630	$ 6,630
Measurement Input, Share Price [Member]
Goodwill [Line Items]
Goodwill, Impaired, Facts and Circumstances Leading to Impairment	10
Commonwealth Edison Co
Goodwill [Line Items]
Goodwill	$ 2,625	2,625		$ 2,600
Pepco Holdings LLC
Goodwill [Line Items]
Goodwill	$ 4,005	$ 4,005	$ 4,000
Potomac Electric Power Company
Goodwill [Line Items]
Goodwill			2,100
Delmarva Power & Light Company
Goodwill [Line Items]
Goodwill			1,400
Atlantic City Electric Company
Goodwill [Line Items]
Goodwill			$ 500