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Related Party Transactions - Additional Information (Details) MMBTU in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) | Apr. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) MMBTU | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |
Other income |  |  | $ 635,000,000 | $ 834,000,000 | $ 402,000,000 |
Unconditional charitable contribution, accrued amount | $ 12,000,000 | $ 12,000,000 |  |  |  |
CECONY |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Net assets | 19,971,000,000 |  | 19,971,000,000 | 19,146,000,000 | 16,878,000,000 | $ 16,312,000,000
Sale of natural gas |  |  | 77,000,000 | 82,000,000 | $ 144,000,000 |
Tax expense due to affiliates |  |  | 344,000,000 | 110,000,000 |  |
Funding limit of CECONY to O&R (not to exceed) |  |  | $ 250,000,000 |  |  |
CECONY | Related Party, Lending of Funds |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Lending period (not more than) (months) |  |  | 12 months |  |  |
CECONY | Equity Method Investee | Mountain Valley Pipeline |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Other income |  |  | $ 28,000,000 |  |  |
Contract term (years) |  |  | 20 years |  |  |
Generating capacity per day (in dekatherms) | MMBTU |  |  | 200 |  |  |
O&R |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Net assets | 1,142,000,000 |  | $ 1,142,000,000 |  |  |
Outstanding loans | $ 0 |  | 0 | 0 |  |
CET Electric | NY Transco | Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Other income |  |  | $ 0 | $ 7,300,000 |  |

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