Consolidated Statements of Changes in Member's Equity (Unaudited) - PHI - USD ($) $ in Millions	Total	Undistributed (Losses)/Gains	Pepco Holdings LLC	Pepco Holdings LLC Membership Interest	Pepco Holdings LLC Undistributed (Losses)/Gains
Beginning Balance at Dec. 31, 2022			$ 11,230	$ 11,582	$ (352)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 669	$ 669	155		155
Distributions to member			(112)		(112)
Contributions from member			405	405
Ending Balance at Mar. 31, 2023			11,678	11,987	(309)
Beginning Balance at Dec. 31, 2023			11,782	12,057	(275)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 658	$ 658	168		168
Distributions to member			(118)		(118)
Contributions from member			487	487
Ending Balance at Mar. 31, 2024			$ 12,319	$ 12,544	$ (225)