Derivatives and Other Financial Instruments - Schedule of Gains and Losses on Derivative Excluded from Assessment of Effectiveness Recognized in Current Earnings (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Offsetting [Abstract]
Amount of loss expected to be recognized into earnings over the next 12 months	$ 13
Earnings recognized in relation to ineffective portion of the hedging relationships	(1)	(1)	3
Amount of gain or (loss) recognized in earnings related amount excluded from the assessment of hedge effectiveness			$ (1)