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Summary of Stock Option Grants (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock options grant shares      
Outstanding at beginning of year 16.6 18.9 21.5
Granted 2.0 2.7 4.0
Exercised (3.6) (4.5) (5.6)
Forfeited/expired (0.4) (0.5) (1.0)
Outstanding at end of year 14.6 16.6 18.9
Exercisable at end of year 9.2 10.0 11.3
Stock options grant weighted-average exercise price      
Outstanding at beginning of year $ 113.06 $ 101.55 $ 92.25
Granted 175.17 157.95 128.74
Exercised 97.70 89.31 81.77
Forfeited/expired 154.65 137.08 118.38
Outstanding at end of year 124.21 $ 113.06 $ 101.55
Exercisable at end of year $ 107.51    
Stock options grant Weighted-average remaining contractual life      
Outstanding at end of year 5 years 10 months 24 days    
Exercisable at end of year 4 years 8 months 12 days    
Stock options grant aggregate intrinsic value      
Outstanding at end of year $ 1,074.6    
Exercisable at end of year $ 826.4