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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions | Mar. 31, 2024 USD ($) certificate $ / MWd $ / MWh $ / MMBTU | Dec. 31, 2023 USD ($) $ / MWh certificate $ / MWd
--- | --- | ---
Liabilities |  |
Derivative liabilities | $ 5,030 | $ 5,507
Commodity contracts |  |
Assets |  |
Derivative assets | 6,173 | 6,138
Liabilities |  |
Derivative liabilities | 4,894 | 5,356
Interest rate contracts |  |
Assets |  |
Derivative assets | 25 | 12
Liabilities |  |
Derivative liabilities | 10 | 8
Level 3 |  |
Assets |  |
Derivative assets | 279 | 334
Liabilities |  |
Derivative liabilities | 312 | 349
Level 3 | Renewable Energy Certificates | Fair Value, Recurring |  |
Assets |  |
Derivative assets | 58 | 58
Liabilities |  |
Derivative liabilities | $ 14 | $ 14
Level 3 | Renewable Energy Certificates | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | certificate | 2,000,000 | 2
Level 3 | Renewable Energy Certificates | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | certificate | 320,000,000 | 320
Level 3 | Renewable Energy Certificates | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | certificate | 16 | 15
Level 3 | Commodity contracts |  |
Assets |  |
Derivative assets | $ 279 | $ 334
Liabilities |  |
Derivative liabilities | 188 | 215
Level 3 | Commodity contracts | Natural Gas Contracts |  |
Assets |  |
Derivative assets | 36 | 39
Liabilities |  |
Derivative liabilities | $ 20 | $ 65
Level 3 | Commodity contracts | Natural Gas Contracts | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | 0 | 1
Level 3 | Commodity contracts | Natural Gas Contracts | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | 11,000,000 | 15
Level 3 | Commodity contracts | Natural Gas Contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | 3 | 3
Level 3 | Commodity contracts | Power Contracts |  |
Assets |  |
Derivative assets | $ 157 | $ 197
Liabilities |  |
Derivative liabilities | $ 91 | $ 66
Level 3 | Commodity contracts | Power Contracts | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | $ / MWh | 1,000,000 | 1
Level 3 | Commodity contracts | Power Contracts | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | $ / MWh | 189,000,000 | 210
Level 3 | Commodity contracts | Power Contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | $ / MWh | 41 | 47
Level 3 | Commodity contracts | FTRs |  |
Assets |  |
Derivative assets | $ 14 | $ 19
Liabilities |  |
Derivative liabilities | $ 35 | $ 37
Level 3 | Commodity contracts | FTRs | Low | Valuation Technique, Discounted Cash Flow | Auction Prices ($ per MWh) |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | (58,000,000) | (58)
Level 3 | Commodity contracts | FTRs | High | Valuation Technique, Discounted Cash Flow | Auction Prices ($ per MWh) |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | 252,000,000 | 252
Level 3 | Commodity contracts | FTRs | Weighted Average | Valuation Technique, Discounted Cash Flow | Auction Prices ($ per MWh) |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | 0 | 0
Level 3 | Interest rate contracts |  |
Assets |  |
Derivative assets | $ 0 | $ 0
Liabilities |  |
Derivative liabilities | $ 0 | $ 0
Level 3 | Interest rate contracts | Low | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates |  |
Fair Value Inputs / Range |  |
Derivative liability, measurement input | 0.0200 | 0.0200
Level 3 | Interest rate contracts | Low | Valuation Technique, Discounted Cash Flow | Credit Loss Rates |  |
Fair Value Inputs / Range |  |
Derivative liability, measurement input | 0.0550 | 0.0600
Level 3 | Interest rate contracts | High | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates |  |
Fair Value Inputs / Range |  |
Derivative liability, measurement input | 0.0300 | 0.0300
Level 3 | Interest rate contracts | High | Valuation Technique, Discounted Cash Flow | Credit Loss Rates |  |
Fair Value Inputs / Range |  |
Derivative liability, measurement input | 0.6000 | 0.6000
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates |  |
Fair Value Inputs / Range |  |
Derivative liability, measurement input | 0.0295 | 0.0295
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Credit Loss Rates |  |
Fair Value Inputs / Range |  |
Derivative liability, measurement input | 0.1284 | 0.1257
Level 3 | Interest rate contracts | Consumer financing program |  |
Assets |  |
Derivative assets | $ 0 | $ 0
Liabilities |  |
Derivative liabilities | $ 124 | $ 134
Level 3 | Interest rate contracts | Consumer financing program | Low | Valuation Technique, Discounted Cash Flow | Collateral Default Rates |  |
Fair Value Inputs / Range |  |
Derivative liability, measurement input | 0.0115 | 0.0043
Level 3 | Interest rate contracts | Consumer financing program | High | Valuation Technique, Discounted Cash Flow | Collateral Default Rates |  |
Fair Value Inputs / Range |  |
Derivative liability, measurement input | 0.9535 | 0.9330
Level 3 | Interest rate contracts | Consumer financing program | Weighted Average | Valuation Technique, Discounted Cash Flow | Collateral Default Rates |  |
Fair Value Inputs / Range |  |
Derivative liability, measurement input | 0.0899 | 0.0812
Level 3 | Capacity Contracts | Capacity Contracts | Fair Value, Recurring |  |
Assets |  |
Derivative assets | $ 14 | $ 21
Liabilities |  |
Derivative liabilities | $ 28 | $ 33
Level 3 | Capacity Contracts | Capacity Contracts | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | $ / MWd | 18,000,000 | 49
Level 3 | Capacity Contracts | Capacity Contracts | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | $ / MWd | 641,000,000 | 658
Level 3 | Capacity Contracts | Capacity Contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring |  |
Fair Value Inputs / Range |  |
Derivative asset/liability, measurement input | $ / MWd | 284 | 285

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