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Related Party Transactions - Additional Information (Details) MMBTU in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) MMBTU agreement | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 31, 2016
Related Party Transaction [Line Items] |  |  |  |  |
Net assets | $ 18,022,000,000 | $ 16,726,000,000 |  |  |
CECONY |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Net assets | 14,147,000,000 | 12,910,000,000 | $ 12,439,000,000 | $ 11,829,000,000 |
Sale of natural gas | 71,000,000 | 83,000,000 | 66,000,000 |  |
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 | $ 33,000,000 | 28,000,000 | $ 31,000,000 |  |
CECONY | Equity Method Investee | Stagecoach | Purchased Power Costs | Clean Energy Businesses |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of electricity sales agreements entered into | agreement | 2 |  |  |  |
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 | 762,000,000 |  |  |  |
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 | 12.50% |  |  |  | 12.50%
Expected reduction in equity interest | 10.00% |  |  |  |

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