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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross carrying amount, total intangible assets | $ 7,501 | $ 7,511
Net, Total Intangible Assets | 6,657 | 6,741
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 4,892 | 4,885
Accumulated Amortization | (844) | (770)
Net, Total Amortized Intangible Assets | 4,048 | 4,115
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,609 | 2,626
Patented Technology |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 1,343 | 1,328
Accumulated Amortization | (174) | (137)
Net, Total Amortized Intangible Assets | 1,169 | 1,191
Customer Relationships |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 3,136 | 3,168
Accumulated Amortization | (503) | (486)
Net, Total Amortized Intangible Assets | 2,633 | 2,682
Miscellaneous |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 413 | 389
Accumulated Amortization | (167) | (147)
Net, Total Amortized Intangible Assets | 246 | 242
Trademarks/trade names |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,486 | 2,483
Miscellaneous |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | $ 123 | $ 143

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