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PRINCIPAL ACCOUNTING POLICIES (Details 12) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based compensation arrangement by share-based payment award      
Number of shares, converted to RSU   1,901,372  
Outstanding at the beginning of the period (in dollars per share)      
Weighted average exercise price, outstanding, beginning balance (in dollars per share) $ 64.81 $ 85.02 $ 67.71
Granted (in dollars per share) $ 79.70 $ 79.55 $ 136.86
Exercised (in dollars per share) $ 48.05 $ 29.39 $ 38.12
Forfeited (in dollars per share) $ 91.75 $ 136.67 $ 115.98
Weighted average exercise price, outstanding, ending balance (in dollars per share) $ 70.42 $ 64.81 $ 85.02
Total unrecognized compensation cost $ 78,000,000    
Weighted average recognized period 2 years 7 months 6 days    
Restricted stock units (RSUs)
      
Number of Shares      
Outstanding at the beginning of the period (in shares) 646,301 190,916  
Granted (in shares) 259,365 164,976 188,407
Converted from option in January 2012 (in shares)   475,343  
Exercised (in shares) (224,939) (124,644)  
Forfeited (in shares) (57,303) (60,290)  
Outstanding at the end of the period (in shares) 623,424 646,301 190,916
Outstanding at the beginning of the period (in dollars per share)      
Weighted average exercise price, outstanding, beginning balance (in dollars per share) $ 101.30 $ 130.29  
Granted (in dollars per share) $ 79.23 $ 82.34  
Exercised (in dollars per share) $ 118.54 $ 129.84  
Forfeited (in dollars per share) $ 85.40 $ 128.27  
Weighted average exercise price, outstanding, ending balance (in dollars per share) $ 83.60 $ 101.30 $ 130.29
Share-based compensation expense 13,200,000 12,500,000 22,500,000
Total unrecognized compensation cost $ 31,000,000    
Weighted average recognized period 2 years 3 months 18 days    
Ctrip 2007 Incentive Plan | Restricted stock units (RSUs)
      
Share-based compensation arrangement by share-based payment award      
Requisite service period 4 years