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Debt - Summary of Current and Long-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | $ 2,306 | $ 2,307
Other | [1] | 6 | 5
Total debt |  | 2,504 | 2,529
Short-term debt (includes current portion of long-term debt) |  | (229) | (254)
Long-term debt (less current portion) |  | 2,275 | 2,275
Notes due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 1,083 | 1,083
Term Loan B due 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 591 | 593
Notes due 2043 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 376 | 376
Term Loan A due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 195 | 195
2017 Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  |  | 25
Accounts Receivable Securitization [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 195 | 195
Junior Subordinated Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 53 | 52
Medium-term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | $ 5 | $ 5
[1] | Includes $20 million and $21 million of debt issuance cost discounts as of December 31, 2018 and September 30, 2018, respectively, in addition to a European short-term loan facility with an outstanding balance of $23 million at both December 31, 2018 and September 30, 2018.

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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 of unamortized debt discount (premium) and debt issuance costs. + 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)(2) -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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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