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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross carrying amount, total intangible assets | $ 7,061 | $ 6,985
Net, Total Intangible Assets | 5,610 | 5,632
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 4,667 | 4,613
Accumulated Amortization | (1,451) | (1,353)
Net, Total Amortized Intangible Assets | 3,216 | 3,260
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,394 | 2,372
Patented Technology |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 1,328 | 1,307
Accumulated Amortization | (403) | (370)
Net, Total Amortized Intangible Assets | 925 | 937
Customer Relationships |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 2,754 | 2,722
Accumulated Amortization | (817) | (759)
Net, Total Amortized Intangible Assets | 1,937 | 1,963
Miscellaneous |  |
Finite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 585 | 584
Accumulated Amortization | (231) | (224)
Net, Total Amortized Intangible Assets | 354 | 360
Trademarks/trade names |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,304 | 2,282
Miscellaneous |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | $ 90 | $ 90

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