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Derivative and Hedging Instruments - Schedule of Derivative Instruments at Gross Value (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Derivative [Line Items] |  |
Assets | $ 62 | $ 103
Liabilities | 319 | 226
Senior Notes |  |
Derivative [Line Items] |  |
Hedged liability, fair value hedge | $ 2,400 | $ 3,900
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Long-term debt | Long-term debt
Foreign exchange forward contracts | Designated as Hedging Instruments: | Prepaid expenses and other current assets |  |
Derivative [Line Items] |  |
Assets | $ 45 | $ 49
Foreign exchange forward contracts | Designated as Hedging Instruments: | Accrued liabilities |  |
Derivative [Line Items] |  |
Liabilities | 196 | 74
Foreign exchange forward contracts | Not Designated as Hedging Instruments: | Prepaid expenses and other current assets |  |
Derivative [Line Items] |  |
Assets | 17 | 18
Foreign exchange forward contracts | Not Designated as Hedging Instruments: | Accrued liabilities |  |
Derivative [Line Items] |  |
Liabilities | 15 | 17
Cross-currency swaps | Designated as Hedging Instruments: | Other assets |  |
Derivative [Line Items] |  |
Assets | 0 | 36
Cross-currency swaps | Designated as Hedging Instruments: | Accrued liabilities and other liabilities |  |
Derivative [Line Items] |  |
Liabilities | 58 | 2
Interest rate swaps | Designated as Hedging Instruments: | Accrued liabilities and other liabilities |  |
Derivative [Line Items] |  |
Liabilities | $ 50 | $ 133

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