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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Income Tax Contingency [Line Items]        
U.S. federal corporate statutory tax rate   21.00% 21.00% 24.50%
Tax expense related to the reduction of deferred tax assets     $ 59 $ 23
Income tax benefit related to release of valuation allowance   $ 25    
Deferred foreign income tax benefit   28 18 26
Release of valuation allowance   38 65 14
Reinvested earnings at foreign subsidiaries $ 234 234    
Accrued interest and penalties 4 4 3  
Uncertain income tax position not recognized 12 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 78 78    
Spain Tax Authority        
Income Tax Contingency [Line Items]        
Net operating loss carryforward 29 29    
Foreign Tax Authority        
Income Tax Contingency [Line Items]        
Release of valuation allowance 33 33 $ 59  
Deferred tax assets, tax credit carryforwards, foreign 10 10    
Deferred foreign income tax benefit   15    
Foreign tax credit carryforward 94 94    
Domestic Tax Authority        
Income Tax Contingency [Line Items]        
Release of valuation allowance       $ 23
Net operating loss carryforward $ 0 $ 0