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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Income (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]    
Accumulated other comprehensive income (loss), reclassified $ (4) $ 7
Amount of gain (loss) recognized in income on derivative (ineffective portion)    (1)
Amount of gain (loss) recognized in income on derivative (amount excluded from hedge effectiveness)    $ (1)