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Summary of Stock Option Grants (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock options grant shares      
Outstanding at beginning of year 23.4 25.1 27.4
Granted 4.3 3.9 3.7
Exercised (5.1) (5.1) (5.7)
Forfeited/expired (0.7) (0.5) (0.3)
Outstanding at end of year 21.9 23.4 25.1
Exercisable at end of year 13.4 14.4 15.6
Stock options grant weighted-average exercise price      
Outstanding at beginning of year $ 77.99 $ 69.15 $ 59.86
Granted 97.33 95.13 94.36
Exercised 62.59 46.09 40.12
Forfeited/expired 96.76 94.56 79.15
Outstanding at end of year 84.76 $ 77.99 $ 69.15
Exercisable at end of year $ 77.31    
Stock options grant Weighted-average remaining contractual life      
Outstanding at end of year 6 years 2 months 12 days    
Exercisable at end of year 4 years 10 months 24 days    
Stock options grant aggregate intrinsic value      
Outstanding at end of year $ 730.7    
Exercisable at end of year $ 546.5