CONSOLIDATED STATEMENT OF SHAREHOLDER’S EQUITY (UNAUDITED) - CECONY - USD ($) shares in Millions, $ in Millions	Total	CECONY	Common Stock	Common Stock CECONY	Additional Paid-In Capital	Additional Paid-In Capital CECONY	Retained Earnings	Retained Earnings CECONY	Repurchased Con Edison Stock CECONY	Capital Stock Expense CECONY	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) CECONY
Beginning balance (shares) at Dec. 31, 2022			355	235
Beginning Balance at Dec. 31, 2022		$ 16,878		$ 589		$ 7,419		$ 9,890	$ (962)	$ (62)		$ 4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		604						604
Common stock dividend to Con Edison	$ (288)	(264)					$ (288)	(264)
Capital contribution by Con Edison		1,675				1,675
Other comprehensive loss	4	(1)									$ 4	(1)
Ending balance (shares) at Mar. 31, 2023			346	235
Ending Balance at Mar. 31, 2023		18,892		$ 589		9,094		10,230	(962)	(62)		3
Beginning balance (shares) at Dec. 31, 2022			355	235
Beginning Balance at Dec. 31, 2022		16,878		$ 589		7,419		9,890	(962)	(62)		4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,185	1,308
Ending balance (shares) at Sep. 30, 2023			345	235
Ending Balance at Sep. 30, 2023		19,113		$ 589		9,139		10,406	(962)	(62)		3
Beginning balance (shares) at Mar. 31, 2023			346	235
Beginning Balance at Mar. 31, 2023		18,892		$ 589		9,094		10,230	(962)	(62)		3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		189						189
Common stock dividend to Con Edison	(281)	(264)					(281)	(264)
Capital contribution by Con Edison		26				26
Other comprehensive loss	(1)										(1)
Ending balance (shares) at Jun. 30, 2023			344	235
Ending Balance at Jun. 30, 2023		18,843		$ 589		9,120		10,155	(962)	(62)		3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	526	515						515
Common stock dividend to Con Edison	(280)	(264)					(280)	(264)
Capital contribution by Con Edison		19				19
Ending balance (shares) at Sep. 30, 2023			345	235
Ending Balance at Sep. 30, 2023		19,113		$ 589		9,139		10,406	(962)	(62)		3
Beginning balance (shares) at Dec. 31, 2023			345	235
Beginning Balance at Dec. 31, 2023	21,158	19,146		$ 589		9,139		10,440	(962)	(62)		2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		694						694
Common stock dividend to Con Edison	(287)	(268)					(287)	(268)
Capital contribution by Con Edison		25				25
Other comprehensive loss	(4)										$ (4)
Ending balance (shares) at Mar. 31, 2024			346	235
Ending Balance at Mar. 31, 2024		19,597		$ 589		9,164		10,866	(962)	(62)		2
Beginning balance (shares) at Dec. 31, 2023			345	235
Beginning Balance at Dec. 31, 2023	21,158	19,146		$ 589		9,139		10,440	(962)	(62)		2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,510	1,417
Ending balance (shares) at Sep. 30, 2024			346	235
Ending Balance at Sep. 30, 2024	21,898	19,873		$ 589		9,253		11,053	(962)	(62)		2
Beginning balance (shares) at Mar. 31, 2024			346	235
Beginning Balance at Mar. 31, 2024		19,597		$ 589		9,164		10,866	(962)	(62)		2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		186						186
Common stock dividend to Con Edison	(287)	(268)					(287)	(268)
Capital contribution by Con Edison		55				55
Ending balance (shares) at Jun. 30, 2024			346	235
Ending Balance at Jun. 30, 2024		19,570		$ 589		9,219		10,784	(962)	(62)		2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	588	537						537
Common stock dividend to Con Edison	(287)	(268)					$ (287)	(268)
Capital contribution by Con Edison		25				25
Stock awards	11	9			$ 11	9
Ending balance (shares) at Sep. 30, 2024			346	235
Ending Balance at Sep. 30, 2024	$ 21,898	$ 19,873		$ 589		$ 9,253		$ 11,053	$ (962)	$ (62)		$ 2