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Short-Term Borrowing (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Short-term Debt [Line Items] |  |  |  |
Ratio of consolidated debt to consolidated total capital |  |  |  | 65
Maximum aggregate limit of failure to pay debt or derivative obligations |  |  |  | $ 150,000,000
Commercial paper, outstanding | $ 2,299,000,000 |  | $ 2,299,000,000 | $ 2,288,000,000
Weighted average interest rate of commercial paper (in percent) |  |  | 5.50% | 5.60%
Loans payable | 0 |  | $ 0 | $ 0
Credit Availability Through March 2028 | Revolving Credit Facility |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Maximum borrowing capacity | 2,500,000,000 |  | 2,500,000,000 |
CECONY |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Commercial paper, outstanding | 1,857,000,000 |  | $ 1,857,000,000 | $ 1,903,000,000
Weighted average interest rate of commercial paper (in percent) |  |  | 5.50% | 5.60%
CECONY | Subsidiaries |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Loans payable | $ 0 |  | $ 0 | $ 0
CECONY | 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 |  |
CECONY | March 2023 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 |  |  |
Maximum borrowing capacity |  | $ 500,000,000 |  |

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