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Debt - Summary of Current and Long-term Debt (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018
Debt Instrument [Line Items] |  |
Unamortized Debt Issuance Expense, Long-Term Debt | $ 20 | $ 21
Short-term debt - Note H | $ 229 | 254
Junior Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |
Debt Instrument, Maturity Date | Jun. 30, 2029 |
Medium-term Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 9.40% |
Debt Instrument, Maturity Date | Jan. 24, 2019 |
Notes due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% |
Debt Instrument, Maturity Date | Aug. 15, 2022 |
Term Loan B due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date | May 17, 2024 |
Debt Instrument, maturity year | 2024 |
Notes due 2043 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.875% |
Debt Instrument, Maturity Date | May 15, 2043 |
Term Loan A due 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date | May 17, 2022 |
Debt Instrument, maturity year | 2022 |
European Facility [Member] |  |
Debt Instrument [Line Items] |  |
Short-term debt - Note H | $ 23 | $ 23

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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