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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross carrying amount, total intangible assets | $ 7,253 | $ 7,090
Total Intangible Assets, Net | 5,384 | 5,356
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 4,882 | 4,762
Accumulated Amortization | (1,869) | (1,734)
Total Definite-Lived Intangible Assets, Net | 3,013 | 3,028
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,371 | 2,328
Technology |  |
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 1,354 | 1,332
Accumulated Amortization | (536) | (497)
Total Definite-Lived Intangible Assets, Net | 818 | 835
Customer Relationships |  |
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 2,826 | 2,773
Accumulated Amortization | (1,040) | (969)
Total Definite-Lived Intangible Assets, Net | 1,786 | 1,804
Miscellaneous |  |
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 702 | 657
Accumulated Amortization | (293) | (268)
Total Definite-Lived Intangible Assets, Net | 409 | 389
Trademarks/trade names |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,291 | 2,248
Miscellaneous |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | $ 80 | $ 80

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