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Debt and Financing Arrangements - Schedule of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Sep. 30, 2025
--- | --- | ---
Long-term debt: |  |
Less: debt issuance costs | $ (36) | $ (31)
Gross long-term debt | 2,389 | 2,395
Less: current portion | 9 | 9
Net long-term debt | 2,380 | 2,386
Short-term debt: |  |
Other bank borrowings | 2 | 2
Total short-term debt | 2 | 2
Term Loan B due in 2031 |  |
Long-term debt: |  |
Long-term debt, gross | $ 624 | 626
Unsecured debt | 8.25% Notes due 2031 |  |
Long-term debt: |  |
Interest rate (as percentage) | 8.25% |
Long-term debt, gross | $ 500 | 500
Unsecured debt | 7.50% Notes due in 2033 |  |
Long-term debt: |  |
Interest rate (as percentage) | 7.50% |
Long-term debt, gross | $ 795 | 795
Unsecured debt | Other bank borrowings and finance lease obligations |  |
Long-term debt: |  |
Long-term debt, gross | $ 6 | 5
Term Loan | 7.00% Secured Notes due 2028 |  |
Long-term debt: |  |
Interest rate (as percentage) | 7.00% |
Long-term debt, gross | $ 500 | $ 500

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