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Earnings per Common Share - Schedule of Earnings per Common Share (Parenthetical) (Detail) - shares
shares in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
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 9