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Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Shares subject to option    
Beginning balance 57,034,108  
Options granted 7,614,970  
Options exercised (7,094,555)  
Options cancelled (1,735,698)  
Ending balance 55,818,825 57,034,108
Weighted-average exercise price    
Beginning balance $ 26.12  
Options granted 39.75  
Options exercised 24.01  
Options cancelled 35.39  
Ending balance $ 27.95 $ 26.12
Average remaining contractual term    
Opening balance 6 years 6 years
Aggregate intrinsic value    
Options exercised $ 139  
Aggregate intrinsic value $ 252 $ 229
Annual grant to eligible employees    
Shares subject to option    
Options granted 7,517,290  
Weighted-average exercise price    
Options granted $ 39.70  
Additional options issued    
Shares subject to option    
Options granted 97,680  
Weighted-average exercise price    
Options granted $ 43.32