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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Income Tax Contingency [Line Items]      
Release of valuation allowance $ 8 $ 6 $ 38
Change in tax rates 1 10 4
Impact of GILTI and FDII 6 4 (2)
Income tax benefit related to release of valuation allowance     25
Deferred foreign income tax benefit 30 5 28
Reinvested earnings at foreign subsidiaries 264    
Accrued interest and penalties 4 4  
Uncertain income tax position not recognized 7 12  
Decrease in uncertain tax positions resulting from ongoing audits and settlements 1    
France Tax Authority      
Income Tax Contingency [Line Items]      
Net operating loss carryforward 40    
Spain Tax Authority      
Income Tax Contingency [Line Items]      
Net operating loss carryforward 17    
Foreign Tax Authority      
Income Tax Contingency [Line Items]      
Release of valuation allowance 8 6  
Change in tax rates   $ 10  
Release of valuation allowance     33
Deferred tax assets, tax credit carryforwards, foreign     10
Deferred foreign income tax benefit     $ 15
Foreign tax credit carryforward 12    
Domestic Tax Authority      
Income Tax Contingency [Line Items]      
Net operating loss carryforward $ 0