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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross carrying amount, total intangible assets | $ 7,023 | $ 7,222
Net, Total Intangible Assets | 5,739 | 6,187
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 4,627 | 4,716
Accumulated Amortization | (1,284) | (1,035)
Net, Total Amortized Intangible Assets | 3,343 | 3,681
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,396 | 2,506
Patented Technology |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 1,316 | 1,317
Accumulated Amortization | (342) | (251)
Net, Total Amortized Intangible Assets | 974 | 1,066
Customer Relationships |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 2,745 | 2,941
Accumulated Amortization | (714) | (599)
Net, Total Amortized Intangible Assets | 2,031 | 2,342
Miscellaneous |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 566 | 458
Accumulated Amortization | (228) | (185)
Net, Total Amortized Intangible Assets | 338 | 273
Trademarks/trade names |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,306 | 2,386
Miscellaneous |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | $ 90 | $ 120

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