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Fair Value Measurements - Reconciliation of Net Liabilities Classified as Level 3 (Detail) - Level 3
$ in Millions
9 Months Ended
Jun. 30, 2022
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ (19)
Additions (1)
Reductions 15
Payments 4
Ending balance $ (1)