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PRINCIPAL ACCOUNTING POLICIES (Details 15)
 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Jun. 13, 2012
USD ($)
Sep. 29, 2011
USD ($)
Sep. 30, 2008
USD ($)
Jul. 30, 2008
USD ($)
Dec. 31, 2013
USD ($)
item
Dec. 31, 2013
CNY
item
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Oct. 31, 2013
2012 Convertible Senior Notes
USD ($)
Dec. 31, 2013
ADS
USD ($)
item
Oct. 31, 2013
ADS
2012 Convertible Senior Notes
USD ($)
Treasury stock disclosures                      
Approved repurchase plan $ 300,000,000 $ 100,000,000 $ 15,000,000 $ 15,000,000              
Number of share repurchase plans                   3  
Number of shares repurchased                   3,777,087  
Cost of repurchased shares             1,733,127,675 158,761,225   256,000,000  
Early conversion of convertible notes                 45,500,000   45,500,000
Stock issued to bond holders                 588,219    
Treasury stock, shares         3,777,087 3,777,087 4,365,306        
Treasury stock at cost         $ 256,230,284 1,551,141,268 1,891,888,900        
Segment reporting disclosures                      
Number of reportable segments         1 1