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Debt - Summary of Current and Long-term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | $ 1,562 | $ 1,513
Other | [1] | 11 | 15
Total debt |  | 1,993 | 1,667
Short-term debt (includes current portion of long-term debt) |  | (446) | (166)
Long-term debt (less current portion) |  | 1,547 | 1,501
4.750% Notes due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 411 | 1,080
2.00% Senior Notes Due 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 561 |
6.875% Notes due 2043 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 282 | 374
Term Loan A due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 250 |
Accounts Receivable Securitization [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 194 | 144
6.50% Junior Subordinated Notes, Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | 54 | $ 54
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of debt |  | $ 230 |
[1] | Includes $15 million and $12 million of debt issuance cost discounts as of June 30, 2020 and September 30, 2019, respectively. Additionally, as of both June 30, 2020 and September 30, 2019, Other included a European short-term loan facility with an outstanding balance of $22 million.

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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=119400593&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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