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Summary of Stock Option Grants (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock options grant shares      
Outstanding at beginning of year 21.5 21.9 23.4
Granted 4.0 4.3 4.3
Exercised (5.6) (4.0) (5.1)
Forfeited/expired (1.0) (0.7) (0.7)
Outstanding at end of year 18.9 21.5 21.9
Exercisable at end of year 11.3 13.4 13.4
Stock options grant weighted-average exercise price      
Outstanding at beginning of year $ 92.25 $ 84.76 $ 77.99
Granted 128.74 117.10 97.33
Exercised 81.77 75.30 62.59
Forfeited/expired 118.38 106.50 96.76
Outstanding at end of year 101.55 $ 92.25 $ 84.76
Exercisable at end of year $ 90.73    
Stock options grant Weighted-average remaining contractual life      
Outstanding at end of year 6 years 3 months 18 days    
Exercisable at end of year 4 years 10 months 24 days    
Stock options grant aggregate intrinsic value      
Outstanding at end of year $ 1,331.4    
Exercisable at end of year $ 917.8