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 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	1,658	793
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
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	226	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
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	922	880
Ending balance (shares) at Jun. 30, 2024			346	235
Ending Balance at Jun. 30, 2024	21,560	19,570		$ 589	9,219		10,784	(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	202	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	$ 21,560	$ 19,570		$ 589	$ 9,219		$ 10,784	$ (962)	$ (62)		$ 2