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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] |  | Other current assets
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  | Other noncurrent assets
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other current liabilities | Other current liabilities
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other noncurrent liabilities | Other noncurrent liabilities
Foreign currency exchange derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] | Other current assets | Other current assets
Derivative asset, current | $ 15 | $ 34
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other noncurrent assets | Other noncurrent assets
Derivative asset, noncurrent | $ 3 |
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other current liabilities | Other current liabilities
Derivative liability, current | $ 32 | $ 8
Derivative liability, noncurrent | 9 | 6
Foreign currency exchange derivatives | Quoted Prices in Active Markets (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, current | 0 | 0
Derivative asset, noncurrent | 0 |
Derivative liability, current | 0 | 0
Derivative liability, noncurrent | 0 | 0
Foreign currency exchange derivatives | Significant Other Observable Inputs (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, current | 15 | 34
Derivative asset, noncurrent | 3 |
Derivative liability, current | 32 | 8
Derivative liability, noncurrent | 9 | 6
Foreign currency exchange derivatives | Significant Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, current | 0 | 0
Derivative asset, noncurrent | 0 |
Derivative liability, current | 0 | 0
Derivative liability, noncurrent | 0 | 0
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, current | 9 | 30
Derivative asset, noncurrent | 1 | 0
Total assets | 10 | 30
Derivative liability, current | $ 32 | $ 8
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other noncurrent liabilities | Other noncurrent liabilities
Total liabilities | $ 41 | $ 144
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, noncurrent | 9 | 6
Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Long-term debt |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, noncurrent | 0 | 130
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, current | 6 | 4
Derivative asset, noncurrent | 2 | 0
Total assets | 8 | 4
Derivative liability, current | $ 0 | $ 0
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other noncurrent liabilities | Other noncurrent liabilities
Total liabilities | $ 0 | $ 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, noncurrent | 0 | 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments under ASC 815 | Foreign currency exchange derivatives | Long-term debt |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, noncurrent | $ 0 | $ 0

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