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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Allowance for doubtful accounts      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 17 $ 18 $ 18
Additions Charged to Cost and Expenses 11 3 4
Deductions (5) (4) (4)
Balance at End of period 23 17 18
Reserves for sales returns      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 23 28 33
Additions Charged to Cost and Expenses 66 88 108
Deductions (65) (93) (113)
Balance at End of period 24 23 28
Allowance for deferred tax asset      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 91 206 193
Additions Charged to Cost and Expenses 1 4 33
Deductions (47) (119) (20)
Balance at End of period $ 45 $ 91 $ 206