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Fair Value of Financial Instruments Unobservable Input Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance as of the beginning of the period | $ 34 | $ 45
Net realized and unrealized (gains)/losses | 9 | (2)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 |  | 0
Transfers out of Level 3 to Level 2 | (4) |
Balance as of the end of the period | $ 39 | 43
Gain (Loss) from Price Risk Management Activity |  | $ 1

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