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Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Shares subject to option        
Beginning balance 53,601,612 57,034,108 56,431,551  
Options granted 6,175,020 7,633,090 9,800,870  
Options exercised [1] (9,431,009) (8,883,101) (6,444,515)  
Options cancelled (1,910,968) (2,182,485) (2,753,798)  
Ending balance 48,434,655 53,601,612 57,034,108  
Exercisable at end of the period 37,240,858      
Weighted-average exercise price        
Beginning balance $ 28.02 $ 26.12 $ 24.19  
Options granted 43.18 39.74 36.84  
Options exercised [1] 26.17 24.09 22.94  
Options cancelled 38.10 35.23 32.35  
Ending balance 29.92 $ 28.02 $ 26.12  
Exercisable at end of the period $ 26.58      
Average remaining contractual term        
Ending balance 5 years      
Exercisable at end of the period (in years) 4 years      
Aggregate intrinsic value        
Options exercised [1] $ 170 $ 174 $ 108  
Aggregate intrinsic value 626 $ 874 $ 1,068 $ 685
Exercisable at end of the period $ 604      
Annual grant to eligible employees        
Shares subject to option        
Options granted 6,012,140 7,517,290 8,899,530  
Weighted-average exercise price        
Options granted $ 43.20 $ 39.70 $ 36.94  
Additional options issued        
Shares subject to option        
Options granted 162,880 115,800 901,340  
Weighted-average exercise price        
Options granted $ 42.54 $ 42.26 $ 35.84  
[1] Cash received from options exercised was $257 million in 2017, $221 million in 2016 and $148 million in 2015. The actual tax benefit realized for the tax deductions from the option exercises totaled $31 million in 2017, $31 million in 2016 and $58 million in 2015.