Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 20,987	$ 20,106
Accumulated Amortization	(8,723)	(7,381)
Finite-Lived Intangible Assets, Net	12,264	12,726
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	15,087	14,399
Accumulated Amortization	(5,979)	(4,983)
Finite-Lived Intangible Assets, Net	9,108	9,417
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,853	4,653
Accumulated Amortization	(2,170)	(1,838)
Finite-Lived Intangible Assets, Net	2,683	2,815
Product rights
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	97	123
Accumulated Amortization	(72)	(83)
Finite-Lived Intangible Assets, Net	25	40
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	408	409
Accumulated Amortization	(155)	(137)
Finite-Lived Intangible Assets, Net	253	271
Patents and other
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	542	523
Accumulated Amortization	(346)	(339)
Finite-Lived Intangible Assets, Net	$ 196	$ 184