Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Reclassification out of developed technologies	$ 42
Intangible amortization expense		$ 346	$ 84	$ 83
Estimated aggregate amortization expense in 2016	558	558
Estimated aggregate amortization expense in 2017	535	535
Estimated aggregate amortization expense in 2018	523	523
Estimated aggregate amortization expense in 2019	519	519
Estimated aggregate amortization expense in 2020	518	518
Crisi Medical Systems Inc
Business Acquisition [Line Items]
Developed technology					$ 49
Cellular Research
Business Acquisition [Line Items]
Developed technology	42	42
Acquired in-process research and development	$ 19	$ 19
Gen Cell Biosystems
Business Acquisition [Line Items]
Acquired in-process research and development						$ 81