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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Contingency [Line Items]      
Change in tax rates $ 10 $ 4 $ (4)
Impact of GILTI and FDII 4 (2) 4
Release of valuation allowance 6 38 65
Deferred foreign income tax benefit 5 28 18
Income tax benefit related to release of valuation allowance   25  
Tax expense related to the reduction of deferred tax assets     $ 59
Reinvested earnings at foreign subsidiaries 259    
Accrued interest and penalties 4 4  
Uncertain income tax position not recognized 12 12  
Decrease in uncertain tax positions resulting from ongoing audits and settlements 2    
France Tax Authority      
Income Tax Contingency [Line Items]      
Net operating loss carryforward 65    
Spain Tax Authority      
Income Tax Contingency [Line Items]      
Net operating loss carryforward 25    
Foreign Tax Authority      
Income Tax Contingency [Line Items]      
Change in tax rates 10    
Release of valuation allowance 6    
Deferred foreign income tax benefit   15  
Release of valuation allowance   33  
Deferred tax assets, tax credit carryforwards, foreign   $ 10  
Foreign tax credit carryforward 68    
Domestic Tax Authority      
Income Tax Contingency [Line Items]      
Net operating loss carryforward $ 0