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Stock Option Plans - Stock Options Outstanding and Exercisable (Detail) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise Prices, minimum $ 23.76      
Range of Exercise Prices, maximum $ 63.60      
Option Outstanding, Number Outstanding 10.6      
Option Outstanding, Weighted Average Remaining Contractual Term (in years) 3 years 11 months 8 days 4 years 1 month 24 days 4 years 1 month 27 days  
Option Outstanding, Weighted Average Exercise Price $ 44.95 $ 41.40 $ 39.25 $ 35.49
Options Exercisable, Number Exercisable 2.5      
Option Exercisable, Weighted Average Exercise Price $ 37.81      
Exercise Prices Range $ 23.76 - $ 35.71 [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise Prices, minimum 23.76      
Range of Exercise Prices, maximum $ 39.17      
Option Outstanding, Number Outstanding 2.6      
Option Outstanding, Weighted Average Remaining Contractual Term (in years) 1 year 6 months 10 days      
Option Outstanding, Weighted Average Exercise Price $ 36.18      
Options Exercisable, Number Exercisable 2.0      
Option Exercisable, Weighted Average Exercise Price $ 35.47      
Exercise Prices Range $ 35.95 - $ 39.17 [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise Prices, minimum 43.71      
Range of Exercise Prices, maximum $ 43.71      
Option Outstanding, Number Outstanding 2.6      
Option Outstanding, Weighted Average Remaining Contractual Term (in years) 5 years 2 months 16 days      
Option Outstanding, Weighted Average Exercise Price $ 43.71      
Exercise Prices Range $ 43.71 - $ 43.71 [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise Prices, minimum 46.17      
Range of Exercise Prices, maximum $ 46.87      
Option Outstanding, Number Outstanding 3.7      
Option Outstanding, Weighted Average Remaining Contractual Term (in years) 3 years 8 months 16 days      
Option Outstanding, Weighted Average Exercise Price $ 46.51      
Options Exercisable, Number Exercisable 0.5      
Option Exercisable, Weighted Average Exercise Price $ 46.87      
Exercise Prices Range $ 46.17 - $ 46.87 [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range of Exercise Prices, minimum 47.92      
Range of Exercise Prices, maximum $ 63.60      
Option Outstanding, Number Outstanding 1.7      
Option Outstanding, Weighted Average Remaining Contractual Term (in years) 6 years 2 months 12 days      
Option Outstanding, Weighted Average Exercise Price $ 56.78