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Schedule II - Valuation and Qualifying Accounts
12 Months Ended
Sep. 30, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
DescriptionBalance at Beginning of PeriodAdditions Charged to Cost and ExpensesDeductionsBalance at End of Period
(in millions)
Fiscal Year Ended September 30, 2021
Allowance for doubtful accounts$23 $$(4)$20 
Reserves for sales returns24 53 (54)23 
Allowance for deferred tax asset45 (9)38 
Fiscal Year Ended September 30, 2020
Allowance for doubtful accounts$17 $11 $(5)$23 
Reserves for sales returns23 66 (65)24 
Allowance for deferred tax asset91 (47)45 
Fiscal Year Ended September 30, 2019
Allowance for doubtful accounts$18 $$(4)$17 
Reserves for sales returns28 88 (93)23 
Allowance for deferred tax asset206 (119)91