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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Allowance for credit losses      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 19 $ 20 $ 23
Additions Charged to Cost and Expenses 5 5 1
Deductions (5) (6) (4)
Balance at End of period 19 19 20
Reserves for sales returns      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 19 23 24
Additions Charged to Cost and Expenses 39 52 53
Deductions (39) (56) (54)
Balance at End of period 19 19 23
Allowance for deferred tax asset      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 29 38 45
Additions Charged to Cost and Expenses 1 2 2
Deductions (5) (11) (9)
Balance at End of period $ 25 $ 29 $ 38