Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Sep. 30, 2016
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,754	$ 7,648
Accumulated Amortization	1,833	1,435
Unamortized intangible assets	68	68
Acquired in-process research and development
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized intangible assets	66	66
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized intangible assets	2	2
Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,375	3,360
Accumulated Amortization	508	339
Developed technology
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,484	3,409
Accumulated Amortization	951	754
Product rights
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	123	125
Accumulated Amortization	49	43
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	408	405
Accumulated Amortization	61	45
Patents and other
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	363	349
Accumulated Amortization	$ 264	$ 254