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Risk Management, Derivative Instruments and Hedging Activities - Statements of Operations Presentation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Unrealized gain (loss) on commodity contracts | $ 92 | $ 91 | $ (90) | $ (44)
Realized and unrealized gain (loss) on interest rate contracts | 218 | 100 | (50) | 157
Interest rate derivatives |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized and unrealized gain (loss) on interest rate contracts | 0 | 1 | (13) | 9
Energy Revenues |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized gain (loss) on commodity contracts | 43 | 38 | 16 | 196
Fuel and Energy Purchases |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Realized gain (loss) on commodity contracts | (5) | (8) | 19 | (7)
Operating Revenues |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Unrealized gain (loss) on commodity contracts | 176 | 76 | (65) | (32)
Energy Expenses |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Unrealized gain (loss) on commodity contracts | $ (84) | $ 15 | $ (25) | $ (12)

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