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Income Taxes - Significant Components of Company's Net Deferred Tax Assets/(Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Deferred tax assets:    
Allowances and reserves $ 25 $ 30
Employee benefits and compensation 78 80
Other accruals 14 19
Tax attribute carryforwards 135 168
Other 3 22
Total deferred tax assets 255 319
Less: Valuation allowance (38) (45)
Deferred tax assets, net of valuation allowance 217 274
Deferred tax liabilities:    
Intangible assets (393) (369)
Total deferred tax liabilities (393) (369)
Net deferred tax liabilities $ (176) $ (95)