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Related Party Transactions - Additional Information (Details) MMBTU in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) MMBTU | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Net assets | $ 20,687,000,000 | $ 20,037,000,000 |  |
CECONY |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net assets | 16,878,000,000 | 16,312,000,000 | $ 14,849,000,000 | $ 14,147,000,000
Sale of natural gas | 144,000,000 | 90,000,000 | 59,000,000 |
Tax expense due to affiliates | 89,000,000 | 10,000,000 |  |
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] |  |  |  |
Amount of transaction | $ 0 | 0 |  |
Contract term (years) | 20 years |  |  |
Generating capacity per day (in dekatherms) | MMBTU | 250 |  |  |
CECONY | Equity Method Investee | Stagecoach | Purchased Power Costs |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction |  | $ 31,000,000 | $ 34,000,000 |
Percentage of equity interest owned |  | 50.00% |  |
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 | $ (4,000,000) |  |
O&R |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net assets | 931,000,000 |  |  |
Outstanding loans | $ 0 | 0 |  |
CET Electric | NY Transco |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership interest, percentage | 45.70% |  |  |
Amounts billed | $ 8,000,000 | $ 5,900,000 |  |
CET Gas | Mountain Valley Pipeline |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of equity interest owned | 9.60% | 10.20% | 11.30% |
Expected reduction in equity interest | 8.00% |  |  |

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