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Fair Value Measurements - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details)
$ in Millions
12 Months Ended
Sep. 30, 2024
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 124
Payments (26)
Reduction for change in estimates (71)
Currency translation 1
Ending balance $ 28