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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
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Offsetting [Abstract]        
Amount of loss expected to be recognized into earnings over the next 12 months     $ 16  
Earnings recognized in relation to ineffective portion of the hedging relationships 5 0 5 0
Amount of gain or (loss) recognized in earnings related amount excluded from the assessment of hedge effectiveness $ (1) $ (2) $ (1) $ (2)