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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Income (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]    
Accumulated other comprehensive income (loss), reclassified   $ (35)
Amount of gain (loss) recognized in income on derivative (ineffective portion)   17
Amount of gain (loss) recognized in income on derivative (amount excluded from hedge effectiveness) $ 8 $ 18