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Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 22,649 | $ 22,525
Accumulated Amortization | (13,261) | (11,654)
Finite-Lived Intangible Assets, Net | 9,389 | 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 | 15,876 | 15,827
Accumulated Amortization | (9,225) | (8,094)
Finite-Lived Intangible Assets, Net | 6,651 | 7,733
Customer relationships |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,522 | 5,513
Accumulated Amortization | (3,291) | (2,878)
Finite-Lived Intangible Assets, Net | 2,231 | 2,635
Patents, trademarks and other |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,251 | 1,185
Accumulated Amortization | (745) | (682)
Finite-Lived Intangible Assets, Net | $ 507 | $ 503

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