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PRINCIPAL ACCOUNTING POLICIES (Details 9) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
PRINCIPAL ACCOUNTING POLICIES        
Number of shares, outstanding, beginning balance 3,919,535 5,433,541 4,414,481  
Weighted average exercise price, outstanding, beginning balance (in dollars per share) $ 64.81 $ 85.02 $ 67.71  
Weighted average remaining contractual life (Years), outstanding, beginning balance 4 years 11 months 26 days 5 years 1 month 20 days 5 years 7 months 2 days 5 years 11 months 23 days
Aggregate intrinsic value, outstanding, beginning balance $ 57,772,345 $ 144,827,231 $ 415,360,566  
Number of shares, granted 945,106 961,980 1,375,345  
Weighted average exercise price, granted (in dollars per share) $ 79.70 $ 79.55 $ 136.86  
Number of shares, exercised (660,459) (502,991) (207,142)  
Weighted average exercise price, exercised (in dollars per share) $ 48.05 $ 29.39 $ 38.12  
Number of shares, forfeited (73,450) (71,623) (149,143)  
Weighted average exercise price, forfeited (in dollars per share) $ 91.75 $ 136.67 $ 115.98  
Number of shares, converted to RSU in January 2012   (1,901,372)    
Weighted average exercise price, converted to RSU in January 2012 (in dollars per share)   $ 91.8    
Number of shares, outstanding, ending balance 4,130,732 3,919,535 5,433,541 4,414,481
Weighted average exercise price, outstanding, ending balance (in dollars per share) $ 70.42 $ 64.81 $ 85.02 $ 67.71
Weighted average remaining contractual life (Years), outstanding, ending balance 4 years 11 months 26 days 5 years 1 month 20 days 5 years 7 months 2 days 5 years 11 months 23 days
Aggregate intrinsic value, outstanding, ending balance 528,988,489 57,772,345 144,827,231 415,360,566
Number of shares, vested and expect to vest 3,982,976      
Weighted average exercise price, vested and expect to vest (in dollars per share) $ 69.95      
Weighted average remaining contractual life (Years), vested and expect to vest 4 years 11 months 1 day      
Aggregate intrinsic value, vested and expect to vest 511,937,931      
Number of shares, exercisable 2,283,785      
Weighted average exercise price, exercisable (in dollars per share) $ 60.18      
Weighted average remaining contractual life (Years), exercisable 3 years 6 months 29 days      
Aggregate intrinsic value, exercisable 315,856,509      
Assumptions        
Pre-vesting forfeiture rate assumptions (as a percent) 8.00%      
Closing stock price (in dollars per share) $ 198.48      
Total intrinsic value of options exercised $ 99,000,000 $ 34,000,000 $ 25,000,000