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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross carrying amount, total intangible assets | $ 7,108 | $ 7,723
Total Intangible Assets, Net | 4,889 | 5,549
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 4,932 | 5,311
Accumulated Amortization | (2,219) | (2,174)
Total Definite-Lived Intangible Assets, Net | 2,713 | 3,137
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,176 | 2,412
Technology |  |
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 1,376 | 1,464
Accumulated Amortization | (621) | (629)
Total Definite-Lived Intangible Assets, Net | 755 | 835
Customer Relationships |  |
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 2,853 | 3,097
Accumulated Amortization | (1,240) | (1,191)
Total Definite-Lived Intangible Assets, Net | 1,613 | 1,906
Miscellaneous |  |
Definite-Lived Intangible Assets, Gross [Abstract] |  |
Gross Carrying Amount | 703 | 750
Accumulated Amortization | (358) | (354)
Total Definite-Lived Intangible Assets, Net | 345 | 396
Trademarks/trade names |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | 2,176 | 2,332
Miscellaneous |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract] |  |
Carrying Amount, Gross and Net | $ 0 | $ 80

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