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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross carrying amount, total intangible assets | $ 7,243 | $ 7,222
Net, Total Intangible Assets | 6,015 | 6,187
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 4,781 | 4,716
Accumulated Amortization | (1,228) | (1,035)
Net, Total Amortized Intangible Assets | 3,553 | 3,681
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,462 | 2,506
Patented Technology |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 1,309 | 1,317
Accumulated Amortization | (310) | (251)
Net, Total Amortized Intangible Assets | 999 | 1,066
Customer Relationships |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 2,930 | 2,941
Accumulated Amortization | (702) | (599)
Net, Total Amortized Intangible Assets | 2,228 | 2,342
Miscellaneous |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 542 | 458
Accumulated Amortization | (216) | (185)
Net, Total Amortized Intangible Assets | 326 | 273
Trademarks/trade names |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,372 | 2,386
Miscellaneous |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | $ 90 | $ 120

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