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Fair Value Measurements (Reconciliation of Net Beginning and Ending Balances Recorded for Net Assets and Liabilities Classified as Level 3) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 99 $ 66 $ 108 $ 63
Unrealized and realized (gain)/loss included in net income (4) 39 (8) 45
Settlements of derivative instruments (3) (3) (8) (6)
Ending balance $ 92 $ 102 $ 92 $ 102