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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