Consolidated Statement of Shareholder’s Equity - CECONY - USD ($) $ 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
BALANCE AS OF BEGINNING OF PERIOD (in shares) at Dec. 31, 2020			342,000,000	235,000,000
BALANCE AS OF BEGINNING OF PERIOD at Dec. 31, 2020		$ 14,849		$ 589	$ 6,169		$ 9,122	$ (962)	$ (62)		$ (7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	$ 1,346	1,344					1,344
Common stock dividend to Con Edison	(1,079)	(988)				$ (1,079)	(988)
Capital contribution by Con Edison		1,100			1,100
Other comprehensive income (loss)	30	7								$ 30	7
BALANCE AS OF END OF PERIOD (in shares) at Dec. 31, 2021			354,000,000	235,000,000
BALANCE AS OF END OF PERIOD at Dec. 31, 2021		16,312		$ 589	7,269		9,478	(962)	(62)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	1,660	1,390					1,390
Common stock dividend to Con Edison	(1,120)	(978)				(1,120)	(978)
Capital contribution by Con Edison		150			150
Other comprehensive income (loss)	$ 17	$ 4								$ 17	4
BALANCE AS OF END OF PERIOD (in shares) at Dec. 31, 2022	354,962,058	235,488,094	355,000,000	235,000,000
BALANCE AS OF END OF PERIOD at Dec. 31, 2022	$ 20,687	$ 16,878		$ 589	7,419		9,890	(962)	(62)		4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NET INCOME	2,519	1,606					1,606
Common stock dividend to Con Edison	$ (1,127)	(1,056)				$ (1,127)	(1,056)
Capital contribution by Con Edison		1,720			1,720
Other comprehensive income (loss)		$ (2)									(2)
BALANCE AS OF END OF PERIOD (in shares) at Dec. 31, 2023	345,415,772	235,488,094	345,000,000	235,000,000
BALANCE AS OF END OF PERIOD at Dec. 31, 2023	$ 21,158	$ 19,146		$ 589	$ 9,139		$ 10,440	$ (962)	$ (62)		$ 2