Intangible Assets - Components of Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,458	$ 1,457
Accumulated Amortization	693	679
Unamortized intangible assets, Total	56	56
Acquired in-process research and development [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized intangible assets, Total	54	54
Trademarks [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized intangible assets, Total	2	2
Core and developed technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	965	942
Accumulated Amortization	425	401
Product rights [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	166	167
Accumulated Amortization	29	24
Patents, trademarks, and other [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	326	349
Accumulated Amortization	$ 238	$ 254