Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Postemployment benefit costs	$ 10	$ 10
CareFusion | Employee Termination
Defined Benefit Plan Disclosure [Line Items]
Employee termination costs	$ 3