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Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 21,069 | $ 20,987
Accumulated Amortization | (10,168) | (8,723)
Finite-Lived Intangible Assets, Net | 10,901 | 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 | 15,080 | 15,087
Accumulated Amortization | (7,023) | (5,979)
Finite-Lived Intangible Assets, Net | 8,058 | 9,108
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 4,859 | 4,853
Accumulated Amortization | (2,521) | (2,170)
Finite-Lived Intangible Assets, Net | 2,338 | 2,683
Patents, trademarks and other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,130 | 1,046
Accumulated Amortization | (624) | (574)
Finite-Lived Intangible Assets, Net | $ 505 | $ 473

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