Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 21,119	$ 21,069
Accumulated Amortization	(10,551)	(10,168)
Net Carrying Amount	10,568	10,901
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	15,106	15,080
Accumulated Amortization	(7,299)	(7,023)
Net Carrying Amount	7,807	8,058
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,862	4,859
Accumulated Amortization	(2,610)	(2,521)
Net Carrying Amount	2,252	2,338
Patents, trademarks and other
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,151	1,130
Accumulated Amortization	(642)	(624)
Net Carrying Amount	$ 509	$ 505