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Related Party Transactions - Additional Information (Details) MMBTU in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) MMBTU | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Net assets | $ 21,158,000,000 | $ 20,687,000,000 |  |
Other income | 834,000,000 | 402,000,000 | $ 22,000,000 |
Unconditional charitable contribution, accrued amount | 12,000,000 |  |  |
CECONY |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net assets | 19,146,000,000 | 16,878,000,000 | 16,312,000,000 | $ 14,849,000,000
Sale of natural gas | 82,000,000 | 144,000,000 | $ 90,000,000 |
Tax expense due to affiliates | 110,000,000 | (89,000,000) |  |
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] |  |  |  |
Contract term (years) | 20 years |  |  |
Generating capacity per day (in dekatherms) | MMBTU | 250 |  |  |
CECONY | Affiliated Entity | Financial Electric Capacity Contract | Con Edison Energy |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Gain (loss) on financial electric capacity contracts | $ 5,000,000 |  |  |
O&R |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net assets | 1,062,000,000 |  |  |
Outstanding loans | $ 0 | 0 |  |
CET Electric | NY Transco |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership interest, percentage | 45.70% |  |  |
CET Electric | NY Transco | Related Party |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Other income | $ 7,300,000 | $ 8,000,000 |  |
CET Electric | New York Transco's Propel NY Energy Project |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership interest, percentage | 41.70% |  |  |

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