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Fair Value of Financial Instruments Unobservable Input Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance as of the beginning of the period | $ 39 | $ 43 | $ 34 | $ 45
Net realized and unrealized (gains)/losses | (5) | 2 | 4 | 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 |  | 0 |  | 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 | (3) |  |  |
Transfers out of Level 3 to Level 2 |  |  | (7) |
Balance as of the end of the period | 31 | 45 | 31 | 45
Gain (Loss) from Price Risk Management Activity | $ 3 | $ 2 | $ 4 | $ 1

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