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v3.23.2

Related Party Transactions - Additional Information (Details) MMBTU in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) MMBTU | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net assets | $ 20,805,000,000 |  | $ 20,805,000,000 |  | $ 20,687,000,000 |  |  |
Other income | 210,000,000 | $ 113,000,000 | 414,000,000 | $ 196,000,000 |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net assets | 18,843,000,000 | 16,568,000,000 | 18,843,000,000 | 16,568,000,000 | 16,878,000,000 | $ 18,892,000,000 | $ 16,618,000,000 | $ 16,312,000,000
CECONY |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Income taxes due to Con Edison |  |  | 77,000,000 |  | (89,000,000) |  |  |
Funding limit of CECONY to O&R (not to exceed) |  |  | 250,000,000 |  |  |  |  |
CECONY | Subsidiaries |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net assets | 18,843,000,000 |  | 18,843,000,000 |  |  |  |  |
Sale of natural gas | 13,000,000 | 26,000,000 | $ 46,000,000 | 71,000,000 |  |  |  |
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 |  |  | 250 |  |  |  |  |
CECONY | Related Party | Financial Electric Capacity Contract | Con Edison Energy |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on financial electric capacity contracts |  | 1,000,000 |  | 3,000,000 |  |  |  |
O&R |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Net assets | 1,028,000,000 |  | $ 1,028,000,000 |  |  |  |  |
Outstanding loans | $ 0 |  | $ 0 |  | $ 0 |  |  |
CET Electric | NY Transco |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Ownership interest (in percent) | 45.70% |  | 45.70% |  |  |  |  |
CET Electric | NY Transco | Related Party |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Other income | $ 2,000,000 | $ 3,000,000 | $ 6,000,000 | $ 4,000,000 |  |  |  |

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