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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 |  |  |

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