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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stock Compensation Plan
       
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Employee stock options to purchase 13 21 13 21