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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross carrying amount, total intangible assets | $ 7,567 | $ 7,511
Net, Total Intangible Assets | 6,625 | 6,741
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 4,950 | 4,885
Accumulated Amortization | (942) | (770)
Net, Total Amortized Intangible Assets | 4,008 | 4,115
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,617 | 2,626
Patented Technology |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 1,344 | 1,328
Accumulated Amortization | (205) | (137)
Net, Total Amortized Intangible Assets | 1,139 | 1,191
Customer Relationships |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 3,163 | 3,168
Accumulated Amortization | (561) | (486)
Net, Total Amortized Intangible Assets | 2,602 | 2,682
Miscellaneous |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 443 | 389
Accumulated Amortization | (176) | (147)
Net, Total Amortized Intangible Assets | 267 | 242
Trademarks/trade names |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,494 | 2,483
Miscellaneous |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | $ 123 | $ 143

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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/presentationRef -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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