Related Party Transactions - Summary of Costs of Administrative and Other Services Provided and Received (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
TOTAL OPERATING REVENUES	$ 15,256	$ 14,663	$ 15,670
Cost of services received	12,524	12,332	13,046
CECONY
Related Party Transaction [Line Items]
TOTAL OPERATING REVENUES	14,129	13,476	13,268
Cost of services received	11,536	11,299	11,133
CECONY | Related Party
Related Party Transaction [Line Items]
TOTAL OPERATING REVENUES	147	146	135
Cost of services received	$ 82	$ 82	$ 75