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Product Warranty (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 21 $ 21
Accruals for warranties issued during the period 7 8
Settlements made (in cash or in kind) during the period (6) (8)
Balance at end of period $ 22 $ 21