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Related Party Transactions - Additional Information (Details) MMBTU in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) MMBTU | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Net assets | $ 18,847,000,000 | $ 18,022,000,000 |  |
CECONY |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net assets | 14,849,000,000 | 14,147,000,000 | $ 12,910,000,000 | $ 12,439,000,000
Sale of natural gas | 59,000,000 | 71,000,000 | 83,000,000 |
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 | $ 34,000,000 | 33,000,000 | $ 28,000,000 |
CECONY | Affiliated Entity | Financial Electric Capacity Contract | Con Edison Energy |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Gain (loss) on financial electric capacity contracts | (1,000,000) | (1,000,000) |  |
O&R |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net assets | 807,000,000 |  |  |
Outstanding loans | $ 0 | $ 0 |  |
CET Electric | NY Transco |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership interest, percentage | 45.70% |  |  |
CET Gas | Mountain Valley Pipeline |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of equity interest owned | 11.30% |  |  |
Expected reduction in equity interest | 8.80% |  |  |

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