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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross carrying amount, total intangible assets | $ 7,209 | $ 7,222
Net, Total Intangible Assets | 6,080 | 6,187
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 4,750 | 4,716
Accumulated Amortization | (1,129) | (1,035)
Net, Total Amortized Intangible Assets | 3,621 | 3,681
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,459 | 2,506
Patented Technology |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 1,306 | 1,317
Accumulated Amortization | (279) | (251)
Net, Total Amortized Intangible Assets | 1,027 | 1,066
Customer Relationships |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 2,926 | 2,941
Accumulated Amortization | (649) | (599)
Net, Total Amortized Intangible Assets | 2,277 | 2,342
Miscellaneous |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 518 | 458
Accumulated Amortization | (201) | (185)
Net, Total Amortized Intangible Assets | 317 | 273
Trademarks/trade names |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,369 | 2,386
Miscellaneous |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | $ 90 | $ 120

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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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