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Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 22,636 | $ 22,525
Accumulated Amortization | (12,864) | (11,654)
Net Carrying Amount | 9,771 | 10,871
Unamortized intangible assets | 16 | 46
Acquired in-process research and development |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Unamortized intangible assets | 14 | 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 | 15,869 | 15,827
Accumulated Amortization | (8,941) | (8,094)
Net Carrying Amount | 6,928 | 7,733
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,522 | 5,513
Accumulated Amortization | (3,188) | (2,878)
Net Carrying Amount | 2,334 | 2,635
Patents, trademarks and other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,245 | 1,185
Accumulated Amortization | (735) | (682)
Net Carrying Amount | $ 510 | $ 503

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