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Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions | Mar. 31, 2023 | Sep. 30, 2022
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 21,113 | $ 20,987
Accumulated Amortization | (9,481) | (8,723)
Net Carrying Amount | 11,632 | 12,264
Unamortized intangible assets | 46 | 46
Acquired in-process research and development |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized intangible assets | 44 | 44
Trademarks |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized intangible assets | 2 | 2
Developed technology |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,140 | 15,087
Accumulated Amortization | (6,530) | (5,979)
Net Carrying Amount | 8,610 | 9,108
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 4,859 | 4,853
Accumulated Amortization | (2,347) | (2,170)
Net Carrying Amount | 2,512 | 2,683
Patents, trademarks and other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,113 | 1,046
Accumulated Amortization | (604) | (574)
Net Carrying Amount | $ 509 | $ 473

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