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Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Shares subject to option        
Beginning balance 57,034,108 56,431,551 55,783,439  
Options granted 7,633,090 9,800,870 10,420,060  
Options exercised [1] (8,883,101) (6,444,515) (8,076,550)  
Options cancelled (2,182,485) (2,753,798) (1,695,398)  
Ending balance 53,601,612 57,034,108 56,431,551  
Exercisable at end of the period 39,016,883      
Weighted-average exercise price        
Beginning balance $ 26.12 $ 24.19 $ 21.96  
Options granted 39.74 36.84 34.14  
Options exercised [1] 24.09 22.94 20.85  
Options cancelled 35.23 32.35 27.65  
Ending balance 28.02 $ 26.12 $ 24.19  
Exercisable at end of the period $ 24.43      
Average remaining contractual term        
Ending balance 6 years      
Exercisable at end of the period (in years) 5 years      
Aggregate intrinsic value        
Aggregate intrinsic value $ 874 $ 1,068 [2] $ 685 $ 744
Options exercised [1] 174 $ 108 $ 125  
Exercisable at end of the period $ 777      
Annual grant to eligible employees        
Shares subject to option        
Options granted 7,517,290 8,899,530 9,919,810  
Weighted-average exercise price        
Options granted $ 39.70 $ 36.94 $ 34.17  
Additional options issued        
Shares subject to option        
Options granted 115,800 901,340 500,250  
Weighted-average exercise price        
Options granted $ 42.26 $ 35.84 $ 33.65  
[1] Cash received from options exercised was $221 million in 2016, $148 million in 2015 and $168 million in 2014. The actual tax benefit realized for the tax deductions from the option exercises totaled $31 million in 2016, $58 million in 2015 and $29 million in 2014.
[2] Prior-year aggregate intrinsic value has been revised.