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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Allowance for credit losses      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 26 $ 19 $ 19
Additions Charged to Cost and Expenses 8 10 5
Deductions (7) (3) (5)
Balance at End of period 27 26 19
Reserves for sales returns      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 20 19 19
Additions Charged to Cost and Expenses 34 37 39
Deductions (37) (36) (39)
Balance at End of period 17 20 19
Allowance for deferred tax asset      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 25 25 29
Additions Charged to Cost and Expenses 26 1 1
Deductions 0 (1) (5)
Balance at End of period $ 51 $ 25 $ 25