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Fair Value Measurements - Reconciliation of Net Liabilities Classified as Level 3 (Detail)
$ in Millions
6 Months Ended
Mar. 31, 2024
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ (1)
Additions 0
Reductions 0
Payments 0
Ending balance $ (1)