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Earnings Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) (Stock Compensation Plan)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock Compensation Plan
   
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Employee stock options to purchase 1 13