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Fair Value of Financial Instruments Unobservable Input Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance as of the beginning of the period | $ 45 | $ 138 | $ 45 | $ 32
Net realized and unrealized (gains)/losses | 15 | (21) | 15 | 78
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 |  | 0 |  | 7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 | 2 |  |  |
Transfers out of Level 3 to Level 2 |  |  | 2 |
Balance as of the end of the period | 62 | 117 | $ 62 | $ 117
Gain (Loss) from Price Risk Management Activity | $ 0 | $ 5 |  |

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