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PRINCIPAL ACCOUNTING POLICIES - Key agreements with the VIEs and summary financial information of the VIEs (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2014
CNY (¥)
Financial information of the group's VIEs                
Total assets $ 24,906,394,926       ¥ 162,048,477,313   ¥ 144,413,901,668  
Total liabilities 11,615,733,658       75,575,447,910   68,893,149,166  
Cash and cash equivalents 2,803,896,483     ¥ 19,215,674,674 18,242,991,687 $ 2,833,358,629 18,434,681,251 ¥ 5,300,887,799
Short-term investment 4,323,492,324       28,129,938,110   14,112,862,288  
Accounts receivables 700,713,570       4,559,052,701   4,624,818,322  
Prepayments and other current assets 948,659,787       6,172,265,172   6,206,985,686  
Accounts payable 1,146,458,548       7,459,203,252   7,278,791,082  
Other payables and accruals 783,338,681       5,096,636,473   2,849,821,247  
Advance from customers 1,209,217,609       7,867,532,529   8,190,840,057  
Net revenues 4,115,953,924 ¥ 26,779,631,018 ¥ 19,228,439,814 10,897,568,061        
Cost of revenues 719,027,574 4,678,209,103 4,729,750,192 3,043,439,819        
Net income / (loss) 332,117,375 2,160,855,280 (1,636,230,855) 2,399,395,247        
Net cash provided by operating activities $ 1,086,464,078 ¥ 7,068,861,226 5,272,730,491 3,048,809,916        
Shareholders of our consolidated affiliated Chinese entities, except for Qunar Beijing | Amended and restated exclusive option agreements                
Financial information of the group's VIEs                
Term of exclusive option agreements 10 years 10 years            
Term of automatic renewal of exclusive option agreements 10 years 10 years            
Ctrip Computer Technology, Ctrip Travel Network and Ctrip Travel Information | Amended and Restated Technical Consulting and Services Agreements                
Financial information of the group's VIEs                
Term of technical consulting and services agreements 10 years 10 years            
Term of automatic renewal of technical consulting and services agreements 10 years 10 years            
Written notice period required to be served for the termination of agreements 30 days 30 days            
Ctrip Computer Technology, Ctrip Travel Network and Ctrip Travel Information | Amended and Restated Technical Consulting and Services Agreements | Minimum                
Financial information of the group's VIEs                
Average rate per ticket based on number of tickets sold (in RMB or US dollars per ticket) $ 0.8 ¥ 5            
Ctrip Computer Technology, Ctrip Travel Network and Ctrip Travel Information | Amended and Restated Technical Consulting and Services Agreements | Maximum                
Financial information of the group's VIEs                
Average rate per ticket based on number of tickets sold (in RMB or US dollars per ticket) $ 1.2 ¥ 8            
Qunar Software | Loan Agreements                
Financial information of the group's VIEs                
Notice period for termination of agreement 15 days 15 days            
Qunar and Qunar Software | Equity option agreement                
Financial information of the group's VIEs                
Written notice period for termination of agreement 30 days 30 days            
Variable interest entities                
Financial information of the group's VIEs                
Amount of registered capital and PRC statutory reserves of VIEs         922,000,000      
Total assets         21,755,512,736   30,544,580,876  
Less: Inter-company receivables         (1,569,895,648)   (2,050,819,348)  
Total assets excluding inter-company         20,185,617,088   28,493,761,528  
Total liabilities         19,282,345,546   29,101,732,239  
Less: Inter-company payables         (12,114,432,077)   (15,904,065,265)  
Total liabilities excluding inter-company         7,167,913,469   13,197,666,974  
Cash and cash equivalents         6,600,000,000   10,000,000,000  
Short-term investment         6,100,000,000   6,500,000,000  
Accounts receivables         3,300,000,000   3,900,000,000  
Prepayments and other current assets         1,900,000,000   3,500,000,000  
Investments (non-current)         1,400,000,000   2,800,000,000  
Accounts payable         3,300,000,000   4,300,000,000  
Other payables and accruals         1,500,000,000   1,300,000,000  
Advance from customers         1,100,000,000   5,000,000,000  
Short- term debt         ¥ 800,000,000   ¥ 1,200,000,000  
Net revenues   ¥ 8,237,250,837 8,706,139,377 6,384,556,234        
Cost of revenues   2,489,892,564 2,442,997,433 1,983,511,461        
Net income / (loss)   ¥ 863,231,207 100,653,423 (73,523,163)        
Revenues as a percent of total 31.00% 31.00%            
Net income before the deduction of inter-company consulting fee charges   ¥ 2,700,000,000 ¥ 2,800,000,000 ¥ 1,000,000,000        
Service fees charged from affiliates as percentage of their total net income 68.30% 68.30% 96.30% 107.10%        
Net cash provided by operating activities   ¥ 1,232,432,873 ¥ 7,190,925,721 ¥ 160,298,446