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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, 2012
Dec. 31, 2011
Shares Under Option    
Shares Under Option, Outstanding at beginning period 8,282  
Shares Under Option, Granted 702  
Shares Under Option, Exercised (2,304)  
Shares Under Option, Canceled (11)  
Shares Under Option, Forfeited (31)  
Shares Under Option, Outstanding at ending period 6,638 8,282
Shares Under Option, Fully vested and expected to vest at ending period 6,605  
Shares Under Option, Exercisable at ending period 4,603  
Weighted-Average Exercise Price per Share    
Weighted - Average Exercise Price per Share, Outstanding at beginning period $ 24.71  
Weighted - Average Exercise Price per Share, Granted $ 61.54  
Weighted - Average Exercise Price per Share, Exercised $ 18.64  
Weighted - Average Exercise Price per Share, Canceled $ 9.94  
Weighted - Average Exercise Price per Share, Forfeited $ 35.10  
Weighted - Average Exercise Price per Share, Outstanding at ending period $ 30.69 $ 24.71
Weighted - Average Exercise Price per Share, Fully vested and expected to vest at ending period $ 30.57  
Weighted - Average Exercise Price per Share, Exercisable at ending period $ 22.69  
Weighted-Average Remaining Contractual Term    
Weighted - Average Remaining Contractual Term (in years), Outstanding 6 years 8 months 12 days 6 years 9 months 18 days
Weighted - Average Remaining Contractual Term (in years), Fully vested and expected to vest at ending period 6 years 8 months 12 days  
Weighted - Average Remaining Contractual Term (in years), Exercisable at ending period 5 years 9 months 18 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Outstanding at beginning period $ 199  
Aggregate Intrinsic Value, Outstanding at ending period 207 199
Aggregate Intrinsic Value, Fully vested and expected to vest at ending period 207  
Aggregate Intrinsic Value, Exercisable at ending period $ 180