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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross carrying amount, total intangible assets | $ 7,755 | $ 7,090
Total Intangible Assets, Net | 5,679 | 5,356
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 5,310 | 4,762
Accumulated Amortization | (2,076) | (1,734)
Total Definite-Lived Intangible Assets, Net | 3,234 | 3,028
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,445 | 2,328
Technology |  |
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 1,484 | 1,332
Accumulated Amortization | (601) | (497)
Total Definite-Lived Intangible Assets, Net | 883 | 835
Customer Relationships |  |
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 3,107 | 2,773
Accumulated Amortization | (1,146) | (969)
Total Definite-Lived Intangible Assets, Net | 1,961 | 1,804
Miscellaneous |  |
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 719 | 657
Accumulated Amortization | (329) | (268)
Total Definite-Lived Intangible Assets, Net | 390 | 389
Trademarks/trade names |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,365 | 2,248
Miscellaneous |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | $ 80 | $ 80

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