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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]        
Accumulated other comprehensive income (loss), reclassified $ (2) $ (10)   $ (22)
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)     6 6
Scenario, Forecast [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Accumulated other comprehensive income (loss), reclassified     $ (26)