CONSOLIDATED STATEMENT OF EQUITY - CECONY (UNAUDITED) - USD ($) shares in Millions, $ in Millions	Total	Subsidiaries	Common Stock	Common Stock Subsidiaries	Additional Paid-In Capital Subsidiaries	Retained Earnings	Retained Earnings Subsidiaries	Repurchased Con Edison Stock Subsidiaries	Capital Stock Expense Subsidiaries	Accumulated Other Comprehensive Income/(Loss)	Accumulated Other Comprehensive Income/(Loss) Subsidiaries
Beginning Balance (shares) at Dec. 31, 2020			342	235
Beginning Balance at Dec. 31, 2020		$ 14,849		$ 589	$ 6,169		$ 9,122	$ (962)	$ (62)		$ (7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 419	465					465
Common stock dividends	(265)	(247)				$ (265)	(247)
Capital contribution by parent		125			125
Other comprehensive income	4									$ 4
Ending Balance (shares) at Mar. 31, 2021			342	235
Ending Balance at Mar. 31, 2021		15,192		$ 589	6,294		9,340	(962)	(62)		(7)
Beginning Balance (shares) at Dec. 31, 2021			354	235
Beginning Balance at Dec. 31, 2021	20,037	16,312		$ 589	7,269		9,478	(962)	(62)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	602	475					475
Common stock dividends	(280)	(245)				$ (280)	(245)
Capital contribution by parent		75			75
Other comprehensive income	0	1									1
Ending Balance (shares) at Mar. 31, 2022			354	235
Ending Balance at Mar. 31, 2022	$ 20,378	$ 16,618		$ 589	$ 7,344		$ 9,708	$ (962)	$ (62)		$ 1