Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 21,113	$ 20,987
Accumulated Amortization	(9,481)	(8,723)
Net Carrying Amount	11,632	12,264
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	15,140	15,087
Accumulated Amortization	(6,530)	(5,979)
Net Carrying Amount	8,610	9,108
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,859	4,853
Accumulated Amortization	(2,347)	(2,170)
Net Carrying Amount	2,512	2,683
Patents, trademarks and other
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,113	1,046
Accumulated Amortization	(604)	(574)
Net Carrying Amount	$ 509	$ 473