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Debt - Additional Information (Details)
$ in Millions, € in Billions
6 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2023
EUR (€)
Mar. 31, 2022
USD ($)
Debt Instrument [Line Items]      
Repayments senior notes | $ $ 2,250   $ 0
Net Investment Hedging      
Debt Instrument [Line Items]      
Notional amount of non-derivative instruments | €   € 1.8  
Senior Notes | Europe      
Debt Instrument [Line Items]      
Debt instrument, face amount | €   € 3.0  
December 2022 Notes | Senior Notes      
Debt Instrument [Line Items]      
Repayments senior notes | $ $ 2,250