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Common Stock (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Summary of information regarding outstanding restricted shares      
Number of shares under stock option, Beginning of the year 11,039,544 10,255,982 7,547,822
Number of Shares Granted 2,277,946 3,485,283 3,234,400
Number of Shares Exercised (2,594,566) (2,469,233) (369,884)
Number of Shares Cancelled (241,174) (232,488) (156,356)
Number of shares under stock option, End of the year 10,481,750 11,039,544 10,255,982
Number of stock options vested and expected to be vest 10,298,319    
Number of stock options vested and expected to be vest, exercisable 5,073,965 5,067,186 5,308,465
Weighted average exercise price, Beginning of year $ 38.01 $ 34.19 $ 37.24
Stock options granted, weighted average exercise price $ 79.68    
Stock options exercised, weighted average exercise $ 36.84    
Stock options cancelled, weighted average exercise $ 40.20    
Weighted average exercise price, End of the year $ 47.20 $ 38.01 $ 34.19
Stock options vested or expected to be vest, weighted average exercise price $ 47.20    
Stock options vested or expected to be vest exercisable, weighted average exercise price $ 38.47 $ 36.31 $ 33.14
Weighted Remaining Contractual Term, Outstanding 7.03    
Weighted Remaining Contractual Term, Vested 7.03    
Weighted Remaining Contractual Term, Exercisable 5.61    
Stock options aggregate intrinsic value $ 217,950,989    
Stock options, vested and expected to vest, aggregate intrinsic value $ 214,136,846