Derivative Financial Instruments - Derivative Instruments Gain (Loss) Recognized in Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Foreign forward exchange contracts [Member] | Interest expense, net [Member] | Derivatives not designated as hedging instruments [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 6	$ 5	$ (18)	$ 7