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Short-Term Borrowing (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2025 USD ($) | Nov. 30, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Short-term Debt [Line Items] |  |  |  |  |  |
Debt term (in years) |  | 364 days |  |  |  |
Commercial paper, outstanding |  |  |  |  | $ 2,170,000,000 | $ 2,288,000,000
Weighted average interest rate (percent) |  |  |  |  | 4.70% | 5.60%
Loans outstanding under credit agreement |  |  |  |  | $ 0 | $ 0
Maximum ratio of consolidated debt to consolidated total capital |  |  |  |  | 0.56 |
Failure to pay, maximum aggregate limit |  | $ 150,000,000 |  |  | $ 150,000,000 | 150,000,000
Short-term borrowings |  | $ 500,000,000 |  |  |  |
Ratio of consolidated debt to consolidated total capital |  | 0.65 |  |  |  |
Subsequent Event |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Short-term borrowings | $ 200,000,000 |  |  |  |  |
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 |  |  |  |  | $ 1,694,000,000 | $ 1,903,000,000
Weighted average interest rate (percent) |  |  |  |  | 4.70% | 5.60%
Maximum ratio of consolidated debt to consolidated total capital |  |  |  |  | 0.57 |
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 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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