Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Postemployment benefit costs	$ 10		$ 12	$ 21	$ 23
Charge associated with workforce reduction actions		36
Workforce reduction costs remaining liability	17			17
CareFusion [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee termination costs	62			62
CareFusion [Member] | Employee Severance [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee termination costs	34			34
Employee termination liability	$ 4			$ 4