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Related Party Transactions - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2024
Related Party Transaction [Line Items]
Restricted net assets	$ 25,719,000,000		$ 25,719,000,000		$ 24,190,000,000
CECONY
Related Party Transaction [Line Items]
Restricted net assets	23,567,000,000	$ 21,615,000,000	23,567,000,000	$ 21,615,000,000	22,037,000,000	$ 23,444,000,000	$ 21,649,000,000	$ 19,971,000,000
Sale of natural gas	12,000,000	$ 19,000,000	73,000,000	$ 63,000,000
Income taxes due to Con Edison			232,000,000		24,000,000
Funding limit of CECONY to O&R (not to exceed)			$ 250,000,000
CECONY \| Related Party, Lending of Funds
Related Party Transaction [Line Items]
Lending period (not more than) (months)			12 months
O&R
Related Party Transaction [Line Items]
Restricted net assets	1,463,000,000		$ 1,463,000,000
Outstanding loans	$ 0		$ 0		$ 0