Short-Term Borrowing (Details)	1 Months Ended
	Mar. 31, 2023 USD ($) project	Mar. 31, 2022 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Short-term Debt [Line Items]
Debt instrument term (in years)	364 days
Commercial paper, outstanding			$ 1,880,000,000	$ 2,640,000,000
Loans outstanding under the credit agreement			$ 0	$ 0
Ratio of consolidated debt to consolidated total capital				65
Percentage of liens of companies consolidated asset				0.10
Maximum aggregate limit of failure to pay debt or derivative obligations				$ 150,000,000
Revolving Credit Facility
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 1,000,000,000
Letter of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 900,000,000
March 2022 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | Revolving Credit Facility | Subsidiaries
Short-term Debt [Line Items]
Debt instrument term (in years)		364 days
March 2023 Credit Agreement Variable Rate 364 Day Revolving Credit Agreement | Revolving Credit Facility | Subsidiaries
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 500,000,000
Debt instrument term (in years)	364 days
January 2023 Borrowing
Short-term Debt [Line Items]
Repayments of debt	$ 200,000,000
June 2022 Borrowing
Short-term Debt [Line Items]
Repayments of debt	400,000,000
Credit Availability Through March 2028 | Revolving Credit Facility
Short-term Debt [Line Items]
Maximum borrowing capacity	800,000,000
Commercial Paper
Short-term Debt [Line Items]
Weighted average interest rate (in percent)			5.50%	4.80%
CECONY | Subsidiaries
Short-term Debt [Line Items]
Commercial paper, outstanding			$ 1,798,000,000	$ 2,300,000,000
CECONY | Credit Availability Through March 2028 | Revolving Credit Facility
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 2,500,000,000
Debt instrument term (in years)	1 year
Number of extensions | project	2
CECONY | Commercial Paper | Subsidiaries
Short-term Debt [Line Items]
Weighted average interest rate (in percent)			5.50%	4.80%