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PRINCIPAL ACCOUNTING POLICIES (Details 10)
$ in Millions
9 Months Ended
Sep. 30, 2015
CNY (¥)
Sep. 30, 2014
CNY (¥)
Sep. 30, 2015
USD ($)
Assumptions      
Total unrecognized compensation cost | $     $ 153
Weighted average recognized period 2 years 8 months 12 days    
Total cash received from the exercise of share options | ¥ ¥ 159,701,667 ¥ 152,960,799