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Earnings per Common Share - Schedule of Earnings per Common Share (Parenthetical) (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Employee Stock Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock awards not included in the computation of diluted earnings per share 5 3 5 3