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Stock Option Activity (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Shares subject to option      
Beginning balance 52,753,039    
Options granted 12,406,792 13,500,000 16,300,000
Options exercised (7,185,616)    
Options cancelled (2,190,776)    
Ending balance 55,783,439 52,753,039  
Exercisable at end of the period 31,036,120    
Weighted-average exercise price      
Beginning balance $ 20.45    
Options granted $ 27.21 $ 37.97 $ 31.81
Options exercised $ 19.41    
Options cancelled $ 23.86    
Ending balance $ 21.96 $ 20.45  
Exercisable at end of the period $ 19.40    
Average remaining contractual term      
Ending balance 7 years    
Exercisable at end of the period (in years) 6 years    
Aggregate intrinsic value      
Ending balance $ 744    
Exercisable at end of the period $ 494