Financial Instruments - Schedule of Cross Currency Swap Agreement Not Designated as Hedge (Detail) (Euro - United States Dollar Currency Swap [Member], Maturity Date, November 2013 [Member]) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2013 EUR (€)
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value	$ (4)
Maturity Date	Nov. 30, 2013	Nov. 30, 2013
Notional amount for foreign currency derivatives		€ 241