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Intangible Assets - Components of Intangible Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
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