v3.6.0.2
Stockholders' Equity - Schedule of Transactions from Employee Option and Share Plans (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity [Abstract]      
Total shares in treasury at beginning of year 3,998,982    
Total cost $ 342    
Shares acquired under repurchase program 15,537,868    
Average price in $ per share $ 82.36    
Amount paid $ 1,280 $ 475 $ 1,435
Shares delivered 8,926,870    
Average price in $ per share $ 79.25    
Amount received $ 115    
Total shares in treasury at end of year 10,609,980 3,998,982  
Total cost $ 915 $ 342