Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets [Line Items]
Intangible amortization expense	$ 151	$ 21	$ 192	$ 63
GenCell Biosystems [Member]
Goodwill And Intangible Assets [Line Items]
Acquired in-process research and development assets						$ 81
CRISI Medical Systems Inc [Member]
Goodwill And Intangible Assets [Line Items]
Increase to developed technology assets					$ 49