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Debt and Financing Arrangements - Long-term Debt (Details) - USD ($) $ in Millions |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
May 29, 2017 | Mar. 31, 2019 | Sep. 30, 2018 | Aug. 19, 2016
Debt Instrument [Line Items] |  |  |  |
Capital lease obligations |  | $ 1 | $ 2 |
Less: debt issuance costs |  | (35) | (32) |
Gross long-term debt |  | 3,374 | 3,424 |
Less: current portion |  | 1 | 2 |
Net long-term debt |  | 3,373 | 3,422 |
Revolving credit facility | Term Loan A - LIBOR plus 1.75% due in 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,200 | 1,200 |
Revolving credit facility | Term Loan A - LIBOR plus 1.75% due in 2021 | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread (as percent) |  | 1.75% |  |
Unsecured debt | 4.875% Notes due in 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 900 | 900 |
Interest rate (as percent) |  | 4.875% |  | 4.875%
Unsecured debt | 3.50% Notes due in 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,123 | 1,162 |
Interest rate (as percent) |  | 3.50% |  | 3.50%
Unsecured debt | European Investment Bank Loan - EURIBOR plus 0.90% due in 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 185 | $ 192 |
Unsecured debt | European Investment Bank Loan - EURIBOR plus 0.90% due in 2022 | EURIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread (as percent) | 0.90% | 0.90% |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: 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=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 3: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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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=109500613&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=6879938&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=6877327&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=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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