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Derivative and Hedging Instruments - Schedule of Derivative Instruments at Gross Value (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Derivative [Line Items] |  |
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Long-term debt | Long-term debt
Senior Notes |  |
Derivative [Line Items] |  |
Hedged liability, fair value hedge | $ 3,900 | $ 3,700
Foreign exchange forward contracts | Designated as Hedging Instruments: | Prepaid expenses and other current assets |  |
Derivative [Line Items] |  |
Assets | 49 | 100
Foreign exchange forward contracts | Designated as Hedging Instruments: | Accrued liabilities |  |
Derivative [Line Items] |  |
Liabilities | 74 | 66
Foreign exchange forward contracts | Not Designated as Hedging Instruments: | Prepaid expenses and other current assets |  |
Derivative [Line Items] |  |
Assets | 18 | 15
Foreign exchange forward contracts | Not Designated as Hedging Instruments: | Accrued liabilities |  |
Derivative [Line Items] |  |
Liabilities | 17 | 16
Cross-currency swaps | Designated as Hedging Instruments: | Other assets |  |
Derivative [Line Items] |  |
Assets | 36 | 178
Cross-currency swaps | Designated as Hedging Instruments: | Other liabilities |  |
Derivative [Line Items] |  |
Liabilities | 2 | 0
Interest rate swaps | Designated as Hedging Instruments: | Other liabilities |  |
Derivative [Line Items] |  |
Liabilities | $ 133 | $ 314

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