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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

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