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Intangible Assets - Components of Intangible Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2025
Sep. 30, 2024
Finite And Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 22,544 $ 22,525
Accumulated Amortization (12,426) (11,654)
Net Carrying Amount 10,118 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 15,805 15,827
Accumulated Amortization (8,634) (8,094)
Net Carrying Amount 7,171 7,733
Customer relationships    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 5,515 5,513
Accumulated Amortization (3,082) (2,878)
Net Carrying Amount 2,434 2,635
Patents, trademarks and other    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,224 1,185
Accumulated Amortization (711) (682)
Net Carrying Amount $ 513 $ 503