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Share-Based Compensation Plans - Nonvested Restricted Stock Unit Awards (Detail) - Restricted Stock Unit Awards - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
NUMBER    
Beginning Balance (in shares) 3,231,327  
Granted (in shares) 815,314  
Vested (in shares) (993,457)  
Forfeited (in shares) (76,064)  
Ending Balance (in shares) 2,977,120 3,231,327
WEIGHTED AVERAGE GRANT- DATE FAIR VALUE PER UNIT    
Nonvested at beginning of year (in dollars per share) $ 69.67  
Granted (in dollars per share) 103.74  
Vested (in dollars per share) 66.82  
Forfeited (in dollars per share) 73.18  
Nonvested at end of year (in dollars per share) $ 79.92 $ 69.67
WEIGHTED AVERAGE REMAINING VESTING TERM (YEARS)    
Nonvested 1 year 10 months 8 days 1 year 10 months 8 days