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Stock Plans - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unamortized compensation expense related to our stock options $ 52    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 57 $ 50 $ 47
Deferred tax benefit related to compensation expense $ 15 13 12
Unamortized compensation expense recognition period 1 year    
Restricted, Deferred Stock Units And Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 83 86 94
Deferred tax benefit related to compensation expense $ 22 $ 24 $ 26
Unamortized compensation expense recognition period 2 years    
Unamortized compensation expense related to restricted and deferred stock $ 111    
Amended 2005 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares award expiration date May 21, 2024    
Shares authorized to be issued under stock option plan 243.7    
Shares available to be granted 74.2