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v3.20.2

Debt and Financing Arrangements - Long-term Debt (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |
Less: debt issuance costs | $ (55) | $ (56)
Gross long-term debt | 4,105 | 3,716
Less: current portion | 8 | 8
Net long-term debt | 4,097 | 3,708
Short-term debt | 202 | 22
Other short-term borrowings | $ 8 | $ 22
Weighted average interest rate on short-term debt outstanding (as percent) | 1.60% | 290.00%
European Investment Bank Loan - EURIBOR plus 1.58% due in 2022 | EURIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread (as percent) | 1.58% |
Revolving credit facility | Term Loan B - LIBOR plus 4.00% due in 2024 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 790 | $ 798
Revolving credit facility | Term Loan B - LIBOR plus 4.00% due in 2024 | LIBOR |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 4.00% |
Unsecured debt | 4.875% Notes due in 2026 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 797 | 900
Interest rate (as percent) | 4.875% |
Unsecured debt | 3.50% Notes due in 2024 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,173 | 1,094
Interest rate (as percent) | 3.50% |
Unsecured debt | 7.00% Notes due in 2026 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 800 | 800
Interest rate (as percent) | 7.00% |
Unsecured debt | 9.00% Notes due in 2025 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 600 | 0
Interest rate (as percent) | 9.00% |
Unsecured debt | European Investment Bank Loan - EURIBOR plus 1.58% due in 2022 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 0 | 180
Short-term debt | $ 194 | $ 0
Unsecured debt | European Investment Bank Loan - EURIBOR plus 1.58% due in 2022 | EURIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread (as percent) | 1.58% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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