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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Taxes [Line Items]        
Effective income tax rate 33.60% 33.20% 31.80% 33.50%
Reasonably possible decrease in unrecognized tax benefits, minimum $ 2   $ 2  
Reasonably possible decrease in unrecognized tax benefits, maximum $ 6   $ 6