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Related Party Transactions - Additional Information (Details) MMBTU in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) MMBTU | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Net assets | $ 20,748,000,000 |  | $ 20,748,000,000 |  | $ 20,037,000,000 |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Net assets | 16,867,000,000 | $ 16,220,000,000 | 16,867,000,000 | $ 16,220,000,000 | 16,312,000,000 | $ 16,568,000,000 | $ 16,618,000,000 | $ 15,924,000,000 | $ 15,192,000,000 | $ 14,849,000,000
CECONY |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Income taxes due to Con Edison |  |  | 12,000,000 |  | $ 10,000,000 |  |  |  |  |
Funding limit of CECONY to O&R (not to exceed) |  |  | 250,000,000 |  |  |  |  |  |  |
CECONY | Subsidiaries |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of natural gas | 26,000,000 | 17,000,000 | $ 97,000,000 | 59,000,000 |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |
Amount of transaction | 0 | 0 | $ 0 | 0 |  |  |  |  |  |
Contract term (years) |  |  | 20 years |  |  |  |  |  |  |
Generating capacity per day (in dekatherms) | MMBTU |  |  | 250 |  |  |  |  |  |  |
CECONY | Equity Method Investee | Stagecoach Gas Services LLC | Purchased Power Costs |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of transaction |  | 8,000,000 |  | 23,000,000 |  |  |  |  |  |
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 | 1,000,000 | 4,000,000 | $ 2,000,000 | 2,000,000 |  |  |  |  |  |
O&R |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Net assets | 923,000,000 |  | 923,000,000 |  |  |  |  |  |  |
Outstanding loans | $ 0 |  | $ 0 |  | $ 0 |  |  |  |  |
CET Electric | NY Transco |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest, percentage | 45.70% |  | 45.70% |  |  |  |  |  |  |
Amounts billed | $ 2,000,000 | $ 0 | $ 6,000,000 | $ 0 |  |  |  |  |  |
Con Edison Gas Pipeline and Storage, LLC | Mountain Valley Pipeline LLC |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of equity interest owned | 9.70% |  | 9.70% |  | 10.20% |  |  |  |  | 11.30%
Equity method investment, ownership percentage, expected decrease | 8.00% |  | 8.00% |  |  |  |  |  |  |

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