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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, 2024 USD ($) $ / MWh $ / MWd $ / MMBTU certificate | Dec. 31, 2023 USD ($) certificate $ / MWh $ / MWd
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Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Cash collateral paid in support of energy risk management activities | $ 309 | $ 441
Cash collateral received in support of energy risk management activities | 199 | 84
Commodity contracts |  |
Assets |  |
Derivative Assets | 4,365 | 6,138
Liabilities |  |
Derivative Liabilities | 3,197 | 5,356
Commodity contracts | Level 3 |  |
Assets |  |
Derivative Assets |  | 334
Liabilities |  |
Derivative Liabilities |  | 215
Commodity contracts | Fair Value, Measurements, Recurring | Level 3 |  |
Assets |  |
Derivative Assets | 195 | 334
Liabilities |  |
Derivative Liabilities | 359 | 349
Consumer Financing Program |  |
Assets |  |
Derivative Assets | 9 | 12
Liabilities |  |
Derivative Liabilities | 3 | 8
Consumer Financing Program | Level 3 |  |
Assets |  |
Derivative Assets | 0 | $ 0
Liabilities |  |
Derivative Liabilities | 0 |
Consumer Financing Program | Level 3 | Low | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability |  | 0.0200
Consumer Financing Program | Level 3 | Low | Credit Loss Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability |  | 0.0600
Consumer Financing Program | Level 3 | High | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability |  | 0.0300
Consumer Financing Program | Level 3 | High | Credit Loss Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability |  | 0.6000
Consumer Financing Program | Level 3 | Weighted Average | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability |  | 0.0295
Consumer Financing Program | Level 3 | Weighted Average | Credit Loss Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability |  | 0.1257
Natural Gas Contracts | Commodity contracts | Level 3 |  |
Assets |  |
Derivative Assets |  | $ 39
Liabilities |  |
Derivative Liabilities |  | $ 65
Natural Gas Contracts | Commodity contracts | Level 3 | Low | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 1
Natural Gas Contracts | Commodity contracts | Level 3 | High | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 15
Natural Gas Contracts | Commodity contracts | Level 3 | Weighted Average | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 3,000,000
Natural Gas Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 |  |
Assets |  |
Derivative Assets | 56 |
Liabilities |  |
Derivative Liabilities | $ 15 |
Natural Gas Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Low | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MMBTU | 2 |
Natural Gas Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | High | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MMBTU | 27 |
Natural Gas Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MMBTU | 4,000,000 |
Power Contracts | Commodity contracts | Level 3 |  |
Assets |  |
Derivative Assets |  | $ 197
Liabilities |  |
Derivative Liabilities |  | $ 66
Power Contracts | Commodity contracts | Level 3 | Low | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 1
Power Contracts | Commodity contracts | Level 3 | High | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 210
Power Contracts | Commodity contracts | Level 3 | Weighted Average | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh |  | 47,000,000
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 |  |
Assets |  |
Derivative Assets | $ 57 |
Liabilities |  |
Derivative Liabilities | $ 86 |
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Low | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | 0 |
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | High | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | 109 |
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | 39,000,000 |
Capacity Contracts | Capacity Contracts | Fair Value, Measurements, Recurring | Level 3 |  |
Assets |  |
Derivative Assets | $ 34 | $ 21
Liabilities |  |
Derivative Liabilities | $ 13 | $ 33
Capacity Contracts | Capacity Contracts | Fair Value, Measurements, Recurring | Level 3 | Low | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWd | 16 | 49
Capacity Contracts | Capacity Contracts | Fair Value, Measurements, Recurring | Level 3 | High | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWd | 510 | 658
Capacity Contracts | Capacity Contracts | Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWd | 220,000,000 | 285,000,000
Renewables Energy Certificates | Fair Value, Measurements, Recurring | Level 3 |  |
Assets |  |
Derivative Assets | $ 30 | $ 58
Liabilities |  |
Derivative Liabilities | $ 14 | $ 14
Renewables Energy Certificates | Fair Value, Measurements, Recurring | Level 3 | Low | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | certificate | 2 | 2
Renewables Energy Certificates | Fair Value, Measurements, Recurring | Level 3 | High | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | certificate | 375 | 320
Renewables Energy Certificates | Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Forward Market Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | certificate | 15,000,000 | 15,000,000
FTRs | Commodity contracts | Level 3 |  |
Assets |  |
Derivative Assets |  | $ 19
Liabilities |  |
Derivative Liabilities |  | $ 37
FTRs | Commodity contracts | Level 3 | Low | Auction Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input |  | (58)
FTRs | Commodity contracts | Level 3 | High | Auction Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input |  | 252
FTRs | Commodity contracts | Level 3 | Weighted Average | Auction Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input |  | 0
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 |  |
Assets |  |
Derivative Assets | $ 18 |
Liabilities |  |
Derivative Liabilities | $ 28 |
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Low | Auction Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | (50) |
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | High | Auction Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | 16,180 |
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Auction Price | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative asset/ liability measurement input | $ / MWh | 0 |
Consumer Financing Program | Consumer Financing Program | Level 3 |  |
Assets |  |
Derivative Assets | $ 0 | $ 0
Liabilities |  |
Derivative Liabilities | $ 203 | $ 134
Consumer Financing Program | Consumer Financing Program | Level 3 | Low | Collateral Default Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.0052 | 0.0043
Consumer Financing Program | Consumer Financing Program | Level 3 | Low | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.0200 |
Consumer Financing Program | Consumer Financing Program | Level 3 | Low | Credit Loss Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.0600 |
Consumer Financing Program | Consumer Financing Program | Level 3 | High | Collateral Default Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.7680 | 0.9330
Consumer Financing Program | Consumer Financing Program | Level 3 | High | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.0300 |
Consumer Financing Program | Consumer Financing Program | Level 3 | High | Credit Loss Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.6000 |
Consumer Financing Program | 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 | 0.1171 | 0.0812
Consumer Financing Program | Consumer Financing Program | Level 3 | Weighted Average | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.0283 |
Consumer Financing Program | Consumer Financing Program | Level 3 | Weighted Average | Credit Loss Rates | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Derivative liability | 0.1422 |

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