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Supplier Financing Programs - Summary of Payment Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Payables and Accruals [Abstract]    
Outstanding payment obligations at beginning of year $ 16 $ 17
Invoices added to supplier finance program 57 52
Invoices paid to supplier finance program (60) (53)
Outstanding payment obligations at September 30 $ 13 $ 16