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Common Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary of stock options      
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 Cancelled (241,174) (232,488) (156,356)
Number of Shares Exercised (2,594,566) (2,469,233) (369,884)
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, 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 $ 44.03 $ 26.03
Stock options cancelled, weighted average exercise price $ 40.20 $ 40.53 $ 29.79
Stock options exercised, weighted average exercise price $ 36.84 $ 30.35 $ 40.86
Weighted average exercise price, End of the year $ 47.20 $ 38.01 $ 34.19
Stock options exercisable, weighted average exercise price $ 38.47 $ 36.31 $ 33.14
Stock options, vested and expected to vest exercisable, aggregate intrinsic value $ 149,787,693