Related Party Transactions - Summary of Costs of Administrative and Other Services Provided and Received (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Related Party Transaction [Line Items]
Total revenues	$ 2,944	$ 3,415	$ 7,347	$ 7,475
TOTAL OPERATING EXPENSES	2,673	3,028	6,192	6,290
CECONY | Related Party
Related Party Transaction [Line Items]
Total revenues	33	33	67	66
TOTAL OPERATING EXPENSES	$ 21	$ 20	$ 40	$ 37