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Fair Value Measurements - Schedule of Commodity Derivatives (Details) $ in Millions | Sep. 30, 2022 USD ($) $ / kW-month $ / MWh $ / Dt | Dec. 31, 2021 USD ($)
--- | --- | ---
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ 1,037 | $ 832
CECONY | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | 836 | 728
Level 3 |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | 37 | 17
Level 3 | CECONY | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | 9 | $ 1
Level 3 | Electricity | Forward energy prices |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ 17 |
Level 3 | Electricity | Forward energy prices | Minimum |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 22.25 |
Level 3 | Electricity | Forward energy prices | Maximum |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 172.80 |
Level 3 | Electricity | Forward energy prices | CECONY | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ 4 |
Level 3 | Electricity | Forward energy prices | CECONY | Minimum | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 37.33 |
Level 3 | Electricity | Forward energy prices | CECONY | Maximum | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 172.80 |
Level 3 | Electricity | Forward capacity prices |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ (4) |
Level 3 | Electricity | Forward capacity prices | Minimum |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / kW-month | 0.55 |
Level 3 | Electricity | Forward capacity prices | Maximum |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / kW-month | 7.26 |
Level 3 | Electricity | Forward capacity prices | CECONY | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ (6) |
Level 3 | Electricity | Forward capacity prices | CECONY | Minimum | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / kW-month | 1.10 |
Level 3 | Electricity | Forward capacity prices | CECONY | Maximum | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / kW-month | 7.26 |
Level 3 | Natural Gas | Forward natural gas prices |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ 0 |
Level 3 | Natural Gas | Forward natural gas prices | Minimum |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / Dt | 3.75 |
Level 3 | Natural Gas | Forward natural gas prices | Maximum |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / Dt | 21.37 |
Level 3 | Transmission Congestion Contracts/Financial Transmission Rights | Inter-zonal forward price curves adjusted for historical zonal losses |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ 3 |
Level 3 | Transmission Congestion Contracts/Financial Transmission Rights | Inter-zonal forward price curves adjusted for historical zonal losses | Minimum |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | (12.89) |
Level 3 | Transmission Congestion Contracts/Financial Transmission Rights | Inter-zonal forward price curves adjusted for historical zonal losses | Maximum |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 207.83 |
Level 3 | Commodity |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ 16 |
Level 3 | Commodity | CECONY | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | 0 |
Level 3 | Transmission Congestion Contracts | Inter-zonal forward price curves adjusted for historical zonal losses | CECONY | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ 2 |
Level 3 | Transmission Congestion Contracts | Inter-zonal forward price curves adjusted for historical zonal losses | CECONY | Minimum | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 1.03 |
Level 3 | Transmission Congestion Contracts | Inter-zonal forward price curves adjusted for historical zonal losses | CECONY | Maximum | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 5.51 |

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