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, 2021			$ 10,585	$ 10,795	$ (210)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 598	$ 597	130		130
Distributions to member			(102)		(102)
Contributions from member			704	704
Ending Balance at Mar. 31, 2022			11,317	11,499	(182)
Beginning Balance at Dec. 31, 2021			10,585	10,795	(210)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,739		518
Ending Balance at Sep. 30, 2022			11,266	11,582	(316)
Beginning Balance at Mar. 31, 2022			11,317	11,499	(182)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	465	465	100		100
Distributions to member			(293)		(293)
Ending Balance at Jun. 30, 2022			11,124	11,499	(375)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	676	676	289		289
Distributions to member			(230)		(230)
Contributions from member			83	83
Ending Balance at Sep. 30, 2022			11,266	11,582	(316)
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, 2022			11,230	11,582	(352)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,711		490
Ending Balance at Sep. 30, 2023			11,785	12,057	(272)
Beginning Balance at Mar. 31, 2023			11,678	11,987	(309)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	343	343	103		103
Distributions to member			(100)		(100)
Ending Balance at Jun. 30, 2023			11,681	11,987	(306)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 700	$ 700	232		232
Distributions to member			(198)		(198)
Contributions from member			70	70
Ending Balance at Sep. 30, 2023			$ 11,785	$ 12,057	$ (272)