Short-Term Borrowing (Details)	1 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) project	Mar. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Short-term Debt [Line Items]
Commercial paper, outstanding			$ 2,288,000,000	$ 2,640,000,000
Weighted average interest rate (percent)			5.60%	4.80%
Loans outstanding under credit agreement			$ 0	$ 0
Maximum ratio of consolidated debt to consolidated total capital			0.54
Failure to pay, maximum aggregate limit			$ 150,000,000	150,000,000
Maximum
Short-term Debt [Line Items]
Maximum ratio of consolidated debt to consolidated total capital			0.65
Revolving Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 1,000,000,000
Letters of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	900,000,000
CECONY
Short-term Debt [Line Items]
Commercial paper, outstanding			$ 1,903,000,000	$ 2,300,000,000
Weighted average interest rate (percent)			5.60%	4.80%
Maximum ratio of consolidated debt to consolidated total capital			0.55
March 2022 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | Revolving Credit | Subsidiaries
Short-term Debt [Line Items]
Debt term (in years)		364 days
Credit Availability Through March 2028 | Revolving Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	800,000,000
Credit Availability Through March 2028 | CECONY | Revolving Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 2,500,000,000
Debt instrument, number of extensions to debt term | project	2
Debt term (in years)	1 year
March 2023 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | Revolving Credit | Subsidiaries
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 500,000,000
Debt term (in years)	364 days