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	12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2012 EUR (€)
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount for foreign currency derivatives		€ 241
Maturity Date	Nov. 30, 2013	Nov. 30, 2013
Fair Value	$ (13)