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Summary of Stock Option Activity (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Shares Under Option    
Shares Under Option, Outstanding at beginning period 6,638  
Shares Under Option, Granted 918  
Shares Under Option, Exercised (460)  
Shares Under Option, Canceled (18)  
Shares Under Option, Forfeited (66)  
Shares Under Option, Outstanding at ending period 7,012 6,638
Shares Under Option, Fully vested and expected to vest at ending period 6,974  
Shares Under Option, Exercisable at ending period 5,019  
Weighted-Average Exercise Price per Share    
Weighted - Average Exercise Price per Share, Outstanding at beginning period $ 30.69  
Weighted - Average Exercise Price per Share, Granted $ 45.43  
Weighted - Average Exercise Price per Share, Exercised $ 18.62  
Weighted - Average Exercise Price per Share, Canceled $ 11.48  
Weighted - Average Exercise Price per Share, Forfeited $ 50.50  
Weighted - Average Exercise Price per Share, Outstanding at ending period $ 33.27 $ 30.69
Weighted - Average Exercise Price per Share, Fully vested and expected to vest at ending period $ 33.17  
Weighted - Average Exercise Price per Share, Exercisable at ending period $ 26.68  
Weighted-Average Remaining Contractual Term    
Weighted - Average Remaining Contractual Term (in years), Outstanding 6 years 3 months 18 days 6 years 8 months 12 days
Weighted - Average Remaining Contractual Term (in years), Fully vested and expected to vest at ending period 6 years 3 months 18 days  
Weighted - Average Remaining Contractual Term (in years), Exercisable at ending period 5 years 3 months 18 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Outstanding at beginning period $ 207  
Aggregate Intrinsic Value, Outstanding at ending period 100 207
Aggregate Intrinsic Value, Fully vested and expected to vest at ending period 100  
Aggregate Intrinsic Value, Exercisable at ending period $ 99