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Related Party Transactions - Additional Information (Details) MMBTU in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) MMBTU	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Related Party Transaction [Line Items]
Net assets		$ 21,898,000,000		$ 21,898,000,000		$ 21,158,000,000
Other income		157,000,000	$ 210,000,000	476,000,000	$ 625,000,000
Unconditional charitable contribution, accrued amount	$ 12,000,000
CECONY
Related Party Transaction [Line Items]
Net assets		19,873,000,000	19,113,000,000	19,873,000,000	19,113,000,000	19,146,000,000	$ 19,570,000,000	$ 19,597,000,000	$ 18,843,000,000	$ 18,892,000,000	$ 16,878,000,000
Income taxes due to Con Edison				452,000,000		110,000,000
Funding limit of CECONY to O&R (not to exceed)				250,000,000
CECONY \| Subsidiaries
Related Party Transaction [Line Items]
Sale of natural gas		14,000,000	14,000,000	$ 52,000,000	60,000,000
CECONY \| Related Party, Lending of Funds
Related Party Transaction [Line Items]
Lending period (not more than) (months)				12 months
CECONY \| Equity Method Investee \| Mountain Valley Pipeline LLC
Related Party Transaction [Line Items]
Contract term (years)				20 years
Generating capacity per day (in dekatherms) \| MMBTU				200
CECONY \| Mountain Valley Pipeline LLC \| Related Party
Related Party Transaction [Line Items]
Other income		12,000,000	12,000,000	$ 12,000,000	12,000,000
O&R
Related Party Transaction [Line Items]
Net assets		1,134,000,000		1,134,000,000
Outstanding loans		0		0		$ 0
CET Electric \| NY Transco \| Related Party
Related Party Transaction [Line Items]
Other income		$ 0	$ 0	$ 0	$ 0
CET Electric \| New York Transco's New York Enery Solution Project
Related Party Transaction [Line Items]
Ownership interest (in percent)		45.70%		45.70%
CET Electric \| New York Transco's Propel NY Energy Project
Related Party Transaction [Line Items]
Ownership interest (in percent)		41.70%		41.70%
CET Electric \| Mountain Valley Pipeline LLC
Related Party Transaction [Line Items]
Ownership interest (in percent)		6.60%		6.60%