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Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Shares subject to option        
Beginning balance 56,431,551 55,783,439 52,753,039  
Options granted 9,800,870 10,420,060 12,406,792  
Options exercised [1] (6,444,515) (8,076,550) (7,185,616)  
Options cancelled (2,753,798) (1,695,398) (2,190,776)  
Ending balance 57,034,108 56,431,551 55,783,439  
Exercisable at end of the period 38,658,921      
Weighted-average exercise price        
Beginning balance $ 24.19 $ 21.96 $ 20.45  
Options granted 36.84 34.14 27.21  
Options exercised [1] 22.94 20.85 19.41  
Options cancelled 32.35 27.65 23.86  
Ending balance 26.12 $ 24.19 $ 21.96  
Exercisable at end of the period $ 22.33      
Average remaining contractual term        
Ending balance 6 years      
Exercisable at end of the period (in years) 5 years      
Aggregate intrinsic value        
Aggregate intrinsic value $ 229 $ 685 $ 744 $ 264
Options exercised [1] 108 $ 125 $ 79  
Exercisable at end of the period $ 870      
Annual grant to eligible employees        
Shares subject to option        
Options granted 8,899,530 9,919,810 11,644,280  
Weighted-average exercise price        
Options granted $ 36.94 $ 34.17 $ 27.05  
Additional granted        
Shares subject to option        
Options granted 901,340 500,250 762,512  
Weighted-average exercise price        
Options granted $ 35.84 $ 33.65 $ 29.69  
[1] Cash received from options exercised was $148 million in 2015, $168 million in 2014 and $139 million in 2013. The actual tax benefit realized for the tax deductions from the option exercises totaled $58 million in 2015, $29 million in 2014 and $14 million in 2013.