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Income Taxes - Significant Components of Company's Net Deferred Tax Assets/(Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Deferred tax assets:    
Allowances and reserves $ 30 $ 27
Employee benefits and compensation 80 79
Other accruals 19 17
Tax attribute carryforwards 168 203
Other 22 3
Total deferred tax assets 319 329
Less: Valuation allowance (45) (91)
Deferred tax assets, net of valuation allowance 274 238
Deferred tax liabilities:    
Intangible assets (369) (372)
Total deferred tax liabilities (369) (372)
Net deferred tax liabilities $ (95) $ (134)