Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance as of January 1,	$ 577	$ 577
Less ARO held for sale	(77)	0
Changes in estimated cash flows	44	58
Accretion expense	18	18
Liabilities settled	(62)	(75)
Ending Balance as of December 31,	500	577
Asset Retirement Obligation, Period Increase (Decrease)	78	87
CECONY
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance as of January 1,	504	508
Less ARO held for sale	0	0
Changes in estimated cash flows	43	55
Accretion expense	14	15
Liabilities settled	(62)	(74)
Ending Balance as of December 31,	499	504
Asset Retirement Obligation, Period Increase (Decrease)	$ 77	$ 85