Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Sep. 30, 2015
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,590	$ 7,723
Accumulated Amortization	1,185	903
Unamortized intangible assets	126	205
Acquired in-process research and development
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized intangible assets	124	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	3,361	3,370
Accumulated Amortization	233	120
Developed technology
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,355	3,487
Accumulated Amortization	635	510
Product rights
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	131	128
Accumulated Amortization	40	35
Trademarks
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	405	405
Accumulated Amortization	36	26
Patents and other
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	338	333
Accumulated Amortization	$ 241	$ 212