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Fair Value Measurements - Schedule of the Fair Value Hierarchy for Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Sep. 30, 2025
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | $ 44 | $ 37
Total liabilities | $ 9 | $ 14
Foreign currency exchange derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other current assets | Other current assets
Foreign currency exchange derivatives | $ 41 | $ 36
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other noncurrent assets | Other noncurrent assets
Foreign currency exchange derivatives | $ 2 | $ 1
Other current liabilities | 6 | 7
Foreign currency exchange derivatives | 0 | 3
Cross-currency interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency exchange derivatives | 1 |
Other current liabilities |  | 1
Foreign currency exchange derivatives | 3 | 3
Quoted Prices in Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 0 | 0
Total liabilities | 0 | 0
Quoted Prices in Active Markets (Level 1) | Foreign currency exchange derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency exchange derivatives | 0 | 0
Foreign currency exchange derivatives | 0 | 0
Other current liabilities | 0 | 0
Foreign currency exchange derivatives | 0 | 0
Quoted Prices in Active Markets (Level 1) | Cross-currency interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency exchange derivatives | 0 |
Other current liabilities |  | 0
Foreign currency exchange derivatives |  |
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 44 | 37
Total liabilities | 9 | 14
Significant Other Observable Inputs (Level 2) | Foreign currency exchange derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency exchange derivatives | 41 | 36
Foreign currency exchange derivatives | 2 | 1
Other current liabilities | 6 | 7
Foreign currency exchange derivatives | 0 | 3
Significant Other Observable Inputs (Level 2) | Cross-currency interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency exchange derivatives | 1 |
Other current liabilities |  | 1
Foreign currency exchange derivatives | 3 | 3
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 0 | 0
Total liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | Foreign currency exchange derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency exchange derivatives | 0 | 0
Foreign currency exchange derivatives | 0 | 0
Other current liabilities | 0 | 0
Foreign currency exchange derivatives | 0 | 0
Significant Unobservable Inputs (Level 3) | Cross-currency interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency exchange derivatives | 0 |
Other current liabilities |  | 0
Foreign currency exchange derivatives |  |

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