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Goodwill and Other Intangibles - Summary of Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 1,526 | $ 1,522
Accumulated amortization | (778) | (712)
Net carrying amount | 748 | 810
Finite and Indefinite Intangible assets [Abstract] |  |
Gross carrying amount | 1,804 | 1,800
Net carrying amount | 1,026 | 1,088
Trademarks and Trade Names [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 66 | 66
Accumulated amortization | (31) | (29)
Net carrying amount | 35 | 37
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Indefinite-lived intangible assets | 278 | 278
Intellectual Property [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 713 | 712
Accumulated amortization | (426) | (391)
Net carrying amount | 287 | 321
Customer and Supplier Relationships [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 747 | 744
Accumulated amortization | (321) | (292)
Net carrying amount | $ 426 | $ 452

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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