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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 23 $ 17 $ 18
Additions Charged to Cost and Expenses 1 11 3
Deductions (4) (5) (4)
Balance at End of period 20 23 17
Reserves for sales returns      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 24 23 28
Additions Charged to Cost and Expenses 53 66 88
Deductions (54) (65) (93)
Balance at End of period 23 24 23
Allowance for deferred tax asset      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 45 91 206
Additions Charged to Cost and Expenses 2 1 4
Deductions (9) (47) (119)
Balance at End of period $ 38 $ 45 $ 91