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	Capital Stock Expense CECONY	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) CECONY
Beginning balance (shares) at Dec. 31, 2023			345	235
Beginning balance at Dec. 31, 2023	$ 21,158	$ 19,146	$ 37	$ 589	$ 9,861	$ 9,139	$ 13,377	$ 10,440	$ (962)	$ (122)	$ (62)	$ 22	$ 2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	720	694					720	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	21,615	19,597	$ 38	$ 589	9,888	9,164	13,810	10,866	(962)	(122)	(62)	18	2
Beginning balance (shares) at Dec. 31, 2023			345	235
Beginning balance at Dec. 31, 2023	21,158	19,146	$ 37	$ 589	9,861	9,139	13,377	10,440	(962)	(122)	(62)	22	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	$ 38	$ 589	9,955	9,253	14,026	11,053	(962)	(122)	(62)	18	2
Beginning balance (shares) at Mar. 31, 2024			346	235
Beginning balance at Mar. 31, 2024	21,615	19,597	$ 38	$ 589	9,888	9,164	13,810	10,866	(962)	(122)	(62)	18	2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	202	186					202	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	$ 38	$ 589	9,918	9,219	13,725	10,784	(962)	(122)	(62)	18	2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	588	537					588	537
Common stock dividend to Con Edison	(287)	(268)					(287)	(268)
Capital contribution by Con Edison		25				25
Stock awards	11				11
Stock awards		9				9
Ending balance (shares) at Sep. 30, 2024			346	235
Ending balance at Sep. 30, 2024	21,898	19,873	$ 38	$ 589	9,955	9,253	14,026	11,053	(962)	(122)	(62)	18	2
Beginning balance (shares) at Dec. 31, 2024			347	235
Beginning balance at Dec. 31, 2024	21,962	19,971	$ 38	$ 589	9,986	9,281	14,048	11,115	(962)	(122)	(62)	29	10
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	791	745					791	745
Common stock dividend to Con Edison	(295)	(284)					(295)	(284)
Capital contribution by Con Edison		1,225				1,241					(16)
Other comprehensive loss	(12)	(8)										(12)	(8)
Ending balance (shares) at Mar. 31, 2025			360	235
Ending balance at Mar. 31, 2025	23,783	21,649	$ 39	$ 589	11,340	10,522	14,544	11,576	(962)	(140)	(78)	17	2
Beginning balance (shares) at Dec. 31, 2024			347	235
Beginning balance at Dec. 31, 2024	21,962	19,971	$ 38	$ 589	9,986	9,281	14,048	11,115	(962)	(122)	(62)	29	10
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,726	1,606
Ending balance (shares) at Sep. 30, 2025			361	235
Ending balance at Sep. 30, 2025	24,168	21,997	$ 39	$ 589	11,404	10,577	14,865	11,869	(962)	(140)	(78)	17	2
Beginning balance (shares) at Mar. 31, 2025			360	235
Beginning balance at Mar. 31, 2025	23,783	21,649	$ 39	$ 589	11,340	10,522	14,544	11,576	(962)	(140)	(78)	17	2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	246	222					246	222
Common stock dividend to Con Edison	(306)	(284)					(306)	(284)
Capital contribution by Con Edison		25				25
Stock awards	3	3			3	3
Ending balance (shares) at Jun. 30, 2025			361	235
Ending balance at Jun. 30, 2025	23,756	21,615	$ 39	$ 589	11,373	10,550	14,484	11,514	(962)	(140)	(78)	17	2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	688	639					688	639
Common stock dividend to Con Edison	(307)	(284)					(307)	(284)
Capital contribution by Con Edison		25				25
Stock awards	2				2	2
Stock awards		2
Ending balance (shares) at Sep. 30, 2025			361	235
Ending balance at Sep. 30, 2025	$ 24,168	$ 21,997	$ 39	$ 589	$ 11,404	$ 10,577	$ 14,865	$ 11,869	$ (962)	$ (140)	$ (78)	$ 17	$ 2