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Guarantees (Tables)
 12 Months Ended
Sep. 30, 2025
Guarantees [Abstract]  
Changes in Carrying Amount of Product Warranty Liability The following table summarizes changes in the total product warranty liability (in millions).
Year Ended September 30,
20252024
Balance at beginning of period$122 $91 
Accruals for warranties issued during the period97 85 
Settlements made (in cash or in kind) during the period(99)(87)
Changes in estimates to pre-existing warranties— 31 
Currency translation— 2 
Balance at end of period$120 $122