Foreign Currency Sale Contracts (Detail) (Foreign Exchange Contract, European Joint Venture) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 EUR (€)
Derivative [Line Items]
Transaction Date Range			July 2011-May 2014
Total transaction amount	$ 135		$ 135		€ 100
Forward purchase date range			August 2015-May 2017
Change in fair value gain (loss)	$ 12	$ (6)	$ 13	$ (2)