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Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Sep. 30, 2023
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 21,119 | $ 21,069
Accumulated Amortization | (10,905) | (10,168)
Net Carrying Amount | 10,214 | 10,901
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 | 15,095 | 15,080
Accumulated Amortization | (7,557) | (7,023)
Net Carrying Amount | 7,538 | 8,058
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 4,860 | 4,859
Accumulated Amortization | (2,696) | (2,521)
Net Carrying Amount | 2,164 | 2,338
Patents, trademarks and other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,164 | 1,130
Accumulated Amortization | (652) | (624)
Net Carrying Amount | $ 512 | $ 505

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