Schedule II - Valuation and Qualifying Accounts (Details) - Allowance For Uncollectible Accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 339	$ 154	$ 74
Charged To Costs And Expenses	78	83	72
Charged To Other Accounts	80	0	0
Deductions	(165)	102	8
Balance At End of Period	332	339	154
CECONY
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	323	143	68
Charged To Costs And Expenses	74	78	65
Charged To Other Accounts	80	0	0
Deductions	(156)	102	10
Balance At End of Period	$ 321	$ 323	$ 143