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Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Shares subject to option    
Beginning balance 53,601,612  
Options granted 6,041,440  
Options exercised [1] (7,837,372)  
Options cancelled (1,536,249)  
Ending balance 50,269,431 53,601,612
Weighted-average exercise price    
Beginning balance $ 28.02  
Options granted 43.21  
Options exercised [1] 26.49  
Options cancelled 38.96  
Ending balance $ 29.75 $ 28.02
Average remaining contractual term    
Ending balance 6 years 6 years
Aggregate intrinsic value    
Aggregate intrinsic value $ 563 $ 874
Options exercised [1] $ 142  
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 29,300  
Weighted-average exercise price    
Options granted $ 44.49  
[1] Cash received from options exercised was $43 million in the three months and $213 million in the nine months ended September 30, 2017. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises totaled $6 million in the three months and $24 million in the nine months ended September 30, 2017.