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Fair Value of Financial Instruments Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance as of the beginning of the period $ 45 $ 32
Net realized and unrealized (gains)/losses (2) (11)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3   7
Transfers out of Level 3 to Level 2 0  
Balance as of the end of the period 43 28
Gain (Loss) from Price Risk Management Activity $ 1 $ 5