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Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Shares subject to option    
Beginning balance 56,431,551  
Options granted 9,768,260  
Options exercised (4,439,379)  
Options cancelled (1,167,068)  
Ending balance 60,593,364  
Weighted-average exercise price    
Beginning balance $ 24.19  
Options granted 36.82  
Options exercised 22.90  
Options cancelled 31.72  
Ending balance $ 26.18  
Aggregate intrinsic value    
Options exercised $ 65  
Aggregate Intrinsic Value $ 906 $ 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 868,730  
Weighted-average exercise price    
Options granted $ 35.59