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Related Party Transactions - Additional Information (Details) MMBTU in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) MMBTU | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Net assets |  | $ 21,560,000,000 |  | $ 21,560,000,000 |  | $ 21,158,000,000 |  |  |
Other income |  | 155,000,000 | $ 210,000,000 | 319,000,000 | $ 414,000,000 |  |  |  |
Unconditional charitable contribution, accrued amount | $ 12,000,000 |  |  |  |  |  |  |  |
CECONY |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Net assets |  | 19,570,000,000 | 18,843,000,000 | 19,570,000,000 | 18,843,000,000 | 19,146,000,000 | $ 19,597,000,000 | $ 18,892,000,000 | $ 16,878,000,000
Income taxes due to Con Edison |  |  |  | 57,000,000 |  | 110,000,000 |  |  |
Funding limit of CECONY to O&R (not to exceed) |  |  |  | 250,000,000 |  |  |  |  |
CECONY | Subsidiaries |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Sale of natural gas |  | 14,000,000 | 13,000,000 | $ 38,000,000 | 46,000,000 |  |  |  |
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 LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Contract term (years) |  |  |  | 20 years |  |  |  |  |
Generating capacity per day (in dekatherms) | MMBTU |  |  |  | 200 |  |  |  |  |
O&R |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Net assets |  | 1,084,000,000 |  | $ 1,084,000,000 |  |  |  |  |
Outstanding loans |  | 0 |  | 0 |  | $ 0 |  |  |
CET Electric | NY Transco | Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Other income |  | $ (2,000,000) | $ 2,000,000 | $ (1,000,000) | $ 6,000,000 |  |  |  |
CET Electric | New York Transco's New York Enery Solution Project |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest (in percent) |  | 45.70% |  | 45.70% |  |  |  |  |
CET Electric | New York Transco's Propel NY Energy Project |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest (in percent) |  | 41.70% |  | 41.70% |  |  |  |  |
CET Electric | Mountain Valley Pipeline LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest (in percent) |  | 6.70% |  | 6.70% |  |  |  |  |

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