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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 20 $ 23 $ 17
Additions Charged to Cost and Expenses 5 1 11
Deductions (6) (4) (5)
Balance at End of period 19 20 23
Reserves for sales returns      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 23 24 23
Additions Charged to Cost and Expenses 52 53 66
Deductions (56) (54) (65)
Balance at End of period 19 23 24
Allowance for deferred tax asset      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 38 45 91
Additions Charged to Cost and Expenses 2 2 1
Deductions (11) (9) (47)
Balance at End of period $ 29 $ 38 $ 45