Statements of Changes in Shareholders Equity (Unaudited) - Pepco - USD ($) $ in Millions	Total	Retained Earnings	Potomac Electric Power Company	Potomac Electric Power Company Common Stock	Potomac Electric Power Company Retained Earnings
Beginning Balance at Dec. 31, 2021			$ 3,475	$ 2,302	$ 1,173
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 598	$ 597	46		46
Common stock dividends	(332)	(332)	(42)		(42)
Contributions from parent			387	387
Ending Balance at Mar. 31, 2022			3,866	2,689	1,177
Beginning Balance at Dec. 31, 2021			3,475	2,302	1,173
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,739		261
Ending Balance at Sep. 30, 2022			3,801	2,767	1,034
Beginning Balance at Mar. 31, 2022			3,866	2,689	1,177
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	465	465	70		70
Common stock dividends	(332)	(332)	(258)		(258)
Ending Balance at Jun. 30, 2022			3,678	2,689	989
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	676	676	145		145
Common stock dividends	(335)	(335)	(100)		(100)
Contributions from parent			78	78
Ending Balance at Sep. 30, 2022			3,801	2,767	1,034
Beginning Balance at Dec. 31, 2022	24,744		3,782	2,767	1,015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	669	669	65		65
Common stock dividends	(359)	(359)	(48)		(48)
Contributions from parent			243	243
Ending Balance at Mar. 31, 2023			4,042	3,010	1,032
Beginning Balance at Dec. 31, 2022	24,744		3,782	2,767	1,015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,711		249
Ending Balance at Sep. 30, 2023	25,470		4,139	3,075	1,064
Beginning Balance at Mar. 31, 2023			4,042	3,010	1,032
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	343	343	64		64
Common stock dividends	(359)	(359)	(67)		(67)
Ending Balance at Jun. 30, 2023			4,039	3,010	1,029
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	700	700	120		120
Common stock dividends	(358)	$ (358)	(85)		(85)
Contributions from parent			65	65
Ending Balance at Sep. 30, 2023	$ 25,470		$ 4,139	$ 3,075	$ 1,064