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Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Shares subject to option    
Beginning balance 56,431,551  
Options granted 9,780,030  
Options exercised (5,573,601)  
Options cancelled (2,435,433)  
Ending balance 58,202,547  
Weighted-average exercise price    
Beginning balance $ 24.19  
Options granted 36.83  
Options exercised 23.03  
Options cancelled 32.21  
Ending balance $ 26.09  
Aggregate intrinsic value    
Options exercised $ 88  
Aggregate Intrinsic Value $ 233 $ 685
Annual grant to eligible employees    
Shares subject to option    
Options granted 8,899,530  
Weighted-average exercise price    
Options granted $ 36.94  
Additional granted    
Shares subject to option    
Options granted 880,500  
Weighted-average exercise price    
Options granted $ 35.70