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Debt and Financing Arrangements - Schedule of Long-term Debt (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Long-term debt: |  |  |
Finance lease obligations | $ 1 | $ 1 |
Less: debt issuance costs | (30) | (32) |
Gross long-term debt | 3,645 | 3,679 |
Less: current portion | 163 | 167 |
Net long-term debt | 3,482 | 3,512 |
Short-term debt: |  |  |
Other bank borrowings | 11 | 17 |
Total short-term debt | $ 11 | 17 |
EURIBOR |  |  |
Short-term debt: |  |  |
Basis spread | 1.58% |  |
Term Loan B - LIBOR plus 3.50% due in 2028 |  |  |
Long-term debt: |  |  |
Long-term debt, gross | $ 995 | 998 |
Term Loan B - LIBOR plus 3.50% due in 2028 | LIBOR |  |  |
Short-term debt: |  |  |
Interest rate | 3.50% |  |
Unsecured Debt | 4.875% Notes due in 2026 |  |  |
Long-term debt: |  |  |
Long-term debt, gross | $ 795 | 795 | $ 797
Short-term debt: |  |  |
Interest rate | 4.875% |  |
Unsecured Debt | 3.50% Notes due in 2024 |  |  |
Long-term debt: |  |  |
Long-term debt, gross | $ 1,132 | 1,161 |
Short-term debt: |  |  |
Interest rate | 3.50% |  |
Unsecured Debt | 9.00% Notes due in 2025 |  |  |
Long-term debt: |  |  |
Long-term debt, gross | $ 600 | 600 |
Short-term debt: |  |  |
Interest rate | 9.00% |  |
Unsecured Debt | European Investment Bank Loan - EURIBOR plus 1.58% due in 2022 |  |  |
Long-term debt: |  |  |
Long-term debt, gross | $ 152 | $ 156 |
Unsecured Debt | European Investment Bank Loan - EURIBOR plus 1.58% due in 2022 | EURIBOR |  |  |
Short-term debt: |  |  |
Basis spread | 1.58% |  |

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