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Fair Value Measurements - Schedule of Commodity Derivatives (Details) $ in Millions | Sep. 30, 2024 USD ($) $ / kW-month $ / MWh | Dec. 31, 2023 USD ($)
--- | --- | ---
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ | $ 743 | $ 723
CECONY | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ | 717 | 699
Level 3 |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ | 1 | 2
Level 3 | CECONY | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ | 1 | $ 1
Level 3 | Electricity | Forward energy prices |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ | $ (12) |
Level 3 | Electricity | Forward energy prices | Minimum |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 33.80 |
Level 3 | Electricity | Forward energy prices | Maximum |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 109.05 |
Level 3 | Electricity | Forward energy prices | Average Market Price |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 58.66 |
Level 3 | Electricity | Forward energy prices | CECONY | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ | $ (12) |
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 | 35.70 |
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 | 109.05 |
Level 3 | Electricity | Forward energy prices | CECONY | Average Market Price | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 59.06 |
Level 3 | Electricity | Forward capacity prices |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ | $ (14) |
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 | 0.96 |
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 | 7.53 |
Level 3 | Electricity | Forward capacity prices | Average Market Price |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / kW-month | 3.92 |
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 | 0.96 |
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 | 7.53 |
Level 3 | Electricity | Forward capacity prices | CECONY | Average Market Price | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / kW-month | 3.96 |
Level 3 | Transmission Congestion Contracts | 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 | $ | $ 1 |
Level 3 | Transmission Congestion Contracts | 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 | 0.18 |
Level 3 | Transmission Congestion Contracts | 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 | 3.35 |
Level 3 | Transmission Congestion Contracts | Inter-zonal forward price curves adjusted for historical zonal losses | Average Market Price |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 1.10 |
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 | $ | $ 1 |
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 | 0.18 |
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 | 3.35 |
Level 3 | Transmission Congestion Contracts | Inter-zonal forward price curves adjusted for historical zonal losses | CECONY | Average Market Price | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Unobservable Inputs Range (dollar per unit) | $ / MWh | 1.10 |
Level 3 | Commodity |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ | $ (25) |
Level 3 | Commodity | CECONY | Subsidiaries |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair Value of commodity derivatives | $ | $ (17) |

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