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Derivative and Hedging Instruments - Schedule of Derivative Instruments at Gross Value (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Foreign exchange forward contracts | Designated as Hedging Instrument | Prepaid expenses and other current assets    
Derivative [Line Items]    
Assets $ 100 $ 718
Foreign exchange forward contracts | Designated as Hedging Instrument | Accrued liabilities    
Derivative [Line Items]    
Liabilities 66 49
Foreign exchange forward contracts | Not Designated as Hedging Instrument | Prepaid expenses and other current assets    
Derivative [Line Items]    
Assets 15 35
Foreign exchange forward contracts | Not Designated as Hedging Instrument | Accrued liabilities    
Derivative [Line Items]    
Liabilities 16 47
Cross-currency swaps | Designated as Hedging Instrument | Other assets    
Derivative [Line Items]    
Assets 178 378
Interest rate swaps | Designated as Hedging Instrument | Other liabilities    
Derivative [Line Items]    
Liabilities $ 314 $ 322