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Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Shares subject to option    
Beginning balance 53,601,612  
Options granted 6,021,450  
Options exercised [1] (2,080,511)  
Options cancelled (589,971)  
Ending balance 56,952,580 53,601,612
Weighted-average exercise price    
Beginning balance $ 28.02  
Options granted 43.20  
Options exercised 26.18  
Options cancelled 37.93  
Ending balance $ 29.59 $ 28.02
Average remaining contractual term    
Ending balance 6 years 6 years
Aggregate intrinsic value    
Aggregate intrinsic value $ 769 $ 874
Options exercised $ 38  
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 9,310  
Weighted-average exercise price    
Options granted $ 44.60  
[1] Cash received from options exercised was $57 million in the three months ended March 31, 2017. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises totaled $8 million in the three months ended March 31, 2017.