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Share-Based Compensation Plans - Nonvested Restricted Stock Unit Awards (Detail) - Restricted Stock Unit Awards - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
NUMBER    
Beginning Balance (in shares) 3,515,632  
Granted (in shares) 863,308  
Vested (in shares) (1,028,835)  
Forfeited (in shares) (118,778)  
Ending Balance (in shares) 3,231,327 3,515,632
WEIGHTED AVERAGE GRANT-DATE FAIR VALUE PER UNIT    
Nonvested at beginning of year (in dollars per share) $ 61.80  
Granted (in dollars per share) 88.19  
Vested (in dollars per share) 58.64  
Forfeited (in dollars per share) 66.79  
Nonvested at end of year (in dollars per share) $ 69.67 $ 61.80
WEIGHTED AVERAGE REMAINING VESTING TERM (YEARS)    
Nonvested 1 year 10 months 8 days 2 years