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Fair Value of Financial Instruments - Significant Unobservable Inputs Used in Fair Value of Level 3 Positions (Details) $ in Millions | Dec. 31, 2023 USD ($) certificate $ / MWd $ / MMBTU $ / MWh | Dec. 31, 2022 USD ($) $ / MWh
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Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Cash collateral paid in support of energy risk management activities | $ 441 | $ 260
Cash collateral received in support of energy risk management activities | 84 | 1,708
Fair Value, Measurements, Recurring | Renewables Energy Certificates | Level 3 |  |
Assets |  |
Derivative Assets | 58 |
Liabilities |  |
Derivative Liabilities | $ 14 |
Fair Value, Measurements, Recurring | Renewables Energy Certificates | Level 3 | Low | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | certificate | 2 |
Fair Value, Measurements, Recurring | Renewables Energy Certificates | Level 3 | High | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | certificate | 320 |
Fair Value, Measurements, Recurring | Renewables Energy Certificates | Level 3 | Weighted Average | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | certificate | 15,000,000 |
Commodity contracts |  |
Assets |  |
Derivative Assets | $ 6,138 | 11,976
Liabilities |  |
Derivative Liabilities | 5,356 | 8,439
Commodity contracts | Level 3 |  |
Assets |  |
Derivative Assets | 334 | 1,251
Liabilities |  |
Derivative Liabilities | 215 | 746
Commodity contracts | Natural Gas Contracts | Level 3 |  |
Assets |  |
Derivative Assets |  | 340
Liabilities |  |
Derivative Liabilities |  | $ 448
Commodity contracts | Natural Gas Contracts | Level 3 | Low |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 2
Commodity contracts | Natural Gas Contracts | Level 3 | High |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 48
Commodity contracts | Natural Gas Contracts | Level 3 | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 6
Commodity contracts | Fair Value, Measurements, Recurring | Level 3 |  |
Assets |  |
Derivative Assets | 334 | $ 1,251
Liabilities |  |
Derivative Liabilities | 349 | 746
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3 |  |
Assets |  |
Derivative Assets | 39 |
Liabilities |  |
Derivative Liabilities | $ 65 |
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3 | Low | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MMBTU | 1 |
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3 | High | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MMBTU | 15 |
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3 | Weighted Average | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MMBTU | 3,000,000 |
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 |  |
Assets |  |
Derivative Assets | $ 197 | 843
Liabilities |  |
Derivative Liabilities | $ 66 | $ 216
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | Low |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 3
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | Low | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | 1 |
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | High |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 431
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | High | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | 210 |
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 48
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | Weighted Average | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | 47,000,000 |
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 |  |
Assets |  |
Derivative Assets | $ 19 | $ 68
Liabilities |  |
Derivative Liabilities | $ 37 | $ 82
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | Low |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | (32)
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | Low | Auction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | (58) |
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | High |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 610
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | High | Auction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | 252 |
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 0
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | Weighted Average | Auction Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | 0 |
Interest rate contracts |  |
Assets |  |
Derivative Assets | $ 12 |
Liabilities |  |
Derivative Liabilities | 8 |
Interest rate contracts | Level 3 |  |
Assets |  |
Derivative Assets | 0 |
Liabilities |  |
Derivative Liabilities | $ 0 |
Interest rate contracts | Level 3 | Low | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.0200 |
Interest rate contracts | Level 3 | Low | Credit Loss Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.0600 |
Interest rate contracts | Level 3 | High | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.0300 |
Interest rate contracts | Level 3 | High | Credit Loss Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.6000 |
Interest rate contracts | Level 3 | Weighted Average | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.0295 |
Interest rate contracts | Level 3 | Weighted Average | Credit Loss Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.1257 |
Interest rate contracts | Consumer Financing Program | Level 3 |  |
Assets |  |
Derivative Assets | $ 0 |
Liabilities |  |
Derivative Liabilities | $ 134 |
Interest rate contracts | Consumer Financing Program | Level 3 | Low | Collateral Default Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.0043 |
Interest rate contracts | Consumer Financing Program | Level 3 | High | Collateral Default Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.9330 |
Interest rate contracts | Consumer Financing Program | Level 3 | Weighted Average | Collateral Default Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.0812 |
Capacity Contracts | Fair Value, Measurements, Recurring | Capacity Contracts | Level 3 |  |
Assets |  |
Derivative Assets | $ 21 |
Liabilities |  |
Derivative Liabilities | $ 33 |
Capacity Contracts | Fair Value, Measurements, Recurring | Capacity Contracts | Level 3 | Low | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWd | 49 |
Capacity Contracts | Fair Value, Measurements, Recurring | Capacity Contracts | Level 3 | High | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWd | 658 |
Capacity Contracts | Fair Value, Measurements, Recurring | Capacity Contracts | Level 3 | Weighted Average | Forward Market Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWd | 285,000,000 |

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