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Related Party Transactions - Additional Information (Details) MMBTU in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) MMBTU | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Common shareholders’ equity | $ 23,783,000,000 | $ 24,168,000,000 | $ 21,898,000,000 | $ 24,168,000,000 | $ 21,898,000,000 | $ 21,962,000,000 | $ 23,756,000,000 | $ 21,560,000,000 | $ 21,615,000,000 | $ 21,158,000,000
Other income |  | 208,000,000 | 157,000,000 | 623,000,000 | 476,000,000 |  |  |  |  |
Unconditional charitable contribution, accrued amount | 12,000,000 |  |  |  |  |  |  |  |  |
CECONY |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Common shareholders’ equity | $ 21,649,000,000 | 21,997,000,000 | 19,873,000,000 | 21,997,000,000 | 19,873,000,000 | 19,971,000,000 | $ 21,615,000,000 | $ 19,570,000,000 | $ 19,597,000,000 | $ 19,146,000,000
Income taxes due to Con Edison |  |  |  | 35,000,000 |  | 344,000,000 |  |  |  |
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 LLC |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Contract term (years) |  |  |  | 20 years |  |  |  |  |  |
Generating capacity per day (in dekatherms) | MMBTU |  |  |  | 200 |  |  |  |  |  |
CECONY | Mountain Valley Pipeline LLC | Related Party |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Other income |  | 14,000,000 |  | $ 41,000,000 |  |  |  |  |  |
CECONY | Subsidiaries |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of natural gas |  | 16,000,000 | 14,000,000 | 80,000,000 | 52,000,000 |  |  |  |  |
O&R |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Common shareholders’ equity |  | 1,291,000,000 |  | 1,291,000,000 |  |  |  |  |  |
Outstanding loans |  | 0 |  | 0 |  | $ 0 |  |  |  |
CET Electric | NY Transco | Related Party |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Other income |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |

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