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Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Shares subject to option    
Beginning balance 53,601,612  
Options granted 6,038,740  
Options exercised [1] (6,099,149)  
Options cancelled (1,270,978)  
Ending balance 52,270,225 53,601,612
Weighted-average exercise price    
Beginning balance $ 28.02  
Options granted 43.20  
Options exercised [1] 27.38  
Options cancelled 38.80  
Ending balance $ 29.59 $ 28.02
Average remaining contractual term    
Ending balance 6 years 6 years
Aggregate intrinsic value    
Aggregate intrinsic value $ 711 $ 874
Options exercised [1] $ 109  
Annual grant to eligible employees    
Shares subject to option    
Options granted 6,012,140  
Weighted-average exercise price    
Options granted $ 43.20  
Additional options issued    
Shares subject to option    
Options granted 26,600  
Weighted-average exercise price    
Options granted $ 44.30  
[1] Cash received from options exercised was $113 million in the three months and $170 million in the six months ended June 30, 2017. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises totaled $10 million in the three months and $18 million in the six months ended June 30, 2017.