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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 67,000,000 $ 65,000,000 $ 55,000,000
Recognized income tax benefits related to stock-based compensation $ 29,000,000 $ 31,000,000 $ 29,000,000
Shares under equity incentive compensation plan for future grant 3,954,712 4,398,496  
Directors Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issuable under deferred compensation plans 10,279 12,033  
Shares issued in connection with deferred compensation plans 225,763    
Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued 89,384 85,761 0
Common stock authorized for issuance 2,500,000    
Cash received from exercise of stock options $ 9,296,000 $ 8,607,000  
Stock Option Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Stock options exercisable period, maximum 10 years 1 day    
Cash realized from exercise of stock options $ 93,000,000 127,000,000 $ 172,000,000
Tax benefits realized from exercise of stock options 6,000,000 9,000,000 12,000,000
Intrinsic value of stock options exercised $ 17,000,000 $ 26,000,000 $ 34,000,000
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years 3 years 4 years
Unrecognized compensation cost expected to be recognized over a weighted-average period (in years) 1 year    
Unrecognized compensation cost related to non-vested awards $ 14,000,000    
Shares issued 218,183 221,822 269,755
Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value $ 24,726,000 $ 24,765,000 $ 27,716,000
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to non-vested awards $ 6,000,000    
Shares issued 324,772 299,525 315,316
Weighted-average grant date fair value $ 37,070,000 $ 33,406,000 $ 32,380,000
Deferred Bonus Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issuable under deferred compensation plans 26,365 29,297