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Product Warranties (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 21 $ 21
Accruals for warranties issued during the period 4 4
Settlements made (in cash or in kind) during the period (4) (5)
Balance at end of period $ 21 $ 20