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Fair Value of Financial Instruments Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance as of the beginning of the period $ 31 $ 45 $ 34 $ 45
Net realized and unrealized (gains)/losses (1) 15 3 15
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3   2   2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 5      
Transfers out of Level 3 to Level 2     (2)  
Balance as of the end of the period $ 35 $ 62 35 62
Gain (Loss) from Price Risk Management Activity     $ 4 $ 1