Derivative Financial Instruments - Derivative Instruments Gain (Loss) Recognized in Income (Detail) (Foreign forward exchange contracts [Member], Interest expense, net [Member], Derivatives not designated as hedging instruments [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
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	$ (3)	$ 5	$ 2	$ 11