Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,648	$ 7,723
Accumulated Amortization	1,435	903
Unamortized intangible assets	68	205
Acquired in-process research and development
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized intangible assets	66	203
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	3,360	3,370
Accumulated Amortization	339	120
Developed technology
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,409	3,487
Accumulated Amortization	754	510
Product rights
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	125	128
Accumulated Amortization	43	35
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	405	405
Accumulated Amortization	45	26
Patents and other
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	349	333
Accumulated Amortization	$ 254	$ 212