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PRINCIPAL ACCOUNTING POLICIES (Details 10)
 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CNY
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2013
23.00-34.99
USD ($)
Dec. 31, 2013
35.00-44.99
USD ($)
Dec. 31, 2013
45.00-58.99
USD ($)
Dec. 31, 2013
59.00-77.99
USD ($)
Dec. 31, 2013
78.00-96.99
USD ($)
Dec. 31, 2013
97.00-129.99
USD ($)
Dec. 31, 2013
130.00-159.99
USD ($)
Share-based compensation disclosures by exercise price range                      
Number of shares, outstanding 4,130,732 4,130,732     1,125 1,353,069 157,558 1,358,411 731,131 466,500 62,938
Weighted-average exercise price, outstanding (in dollars per share)         $ 30.50 $ 38.06 $ 58.39 $ 76.78 $ 91.36 $ 106.12 $ 151.78
Weighted-average remaining contractual life (years), outstanding         1 month 13 days 3 years 29 days 1 year 1 month 13 days 6 years 11 months 23 days 5 years 2 months 26 days 5 years 7 months 10 days 5 years 2 months 1 day
Number of shares, exercisable 2,283,785 2,283,785     1,125 1,353,069 157,558 98,324 374,298 257,333 42,078
Weighted-average exercise price, exercisable (in dollars per share)         $ 30.50 $ 38.06 $ 58.39 $ 70.69 $ 94.61 $ 108.79 $ 150.76
Weighted-average remaining contractual life (years), exercisable         1 month 13 days 3 years 29 days 1 year 1 month 13 days 6 years 5 months 5 days 4 years 3 months 11 days 5 years 4 months 24 days 5 years 1 month 6 days
Assumptions                      
Weighted average fair value of options granted (in dollars per share) $ 38.40   $ 38.01 $ 64.79              
Total unrecognized compensation cost $ 78,000,000                    
Weighted average recognized period 2 years 7 months 6 days 2 years 7 months 6 days                  
Total cash received from the exercise of share options $ 30,000,000 180,261,090