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TAXATION - Reconciliation of tax rate and components of deferred tax assets and liabilities (Details) - CNY (¥)
12 Months Ended 36 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of the differences between statutory tax rate and effective tax rate            
Statutory CIT rate (as a percent) 25.00% 25.00% 25.00%      
Tax differential from statutory rate applicable to subsidiaries with preferential tax rates (as a percent) 6.00% 8.00% (5.00%)      
Gain on deconsolidation of a subsidiary with a withholding tax rate of 10% versus the statutory CIT rate     (11.00%)      
Non-deductible expenses and non-taxable income incurred 4.00% (50.00%) 6.00%      
Change in valuation allowance (as a percent) 2.00% (10.00%) 1.00%      
Effective CIT rate (as a percent) 37.00% (27.00%) 16.00%      
Withholding tax rate (as a percent) 10.00% 10.00% 10.00%      
Increase in income tax due to share based compensation charge ¥ 458,000,000 ¥ 890,000,000 ¥ 161,000,000      
Increase in income tax rate due to share based compensation charge 13.00% (51.00%) 5.00%      
Deferred tax assets:            
Accrued expenses         ¥ 331,524,551 ¥ 149,205,615
Loss carry forward         150,575,892 159,747,175
Accrued liability for customer reward related programs         99,188,976 122,635,196
Accrued staff salary         4,018,972 55,228,349
Others         73,875,163 38,782,032
Less: valuation allowance of deferred tax assets ¥ 150,286,773 ¥ 31,489,450 ¥ 183,449,500 ¥ 183,449,500 197,214,279 150,286,773
Total deferred tax assets         461,969,275 375,311,594
Deferred tax liabilities            
Recognition of intangible assets arise from business combinations and unrealized holding gain         (3,847,440,251) (3,607,882,808)
Net deferred tax assets/(liabilities)         (3,385,470,976) (3,232,571,214)
Movement of valuation allowances            
Balance at beginning of year 150,286,773 31,489,450 183,449,500 183,449,500    
Current year additions 46,927,506 118,797,323 31,590,648      
Deconsolidation of Tujia     (183,550,698)      
Balance at end of year ¥ 197,214,279 ¥ 150,286,773 ¥ 31,489,450 ¥ 197,214,279    
Operating tax loss carry forwards         662,000,000  
Unrecognized tax benefit and accrual         ¥ 0 ¥ 0
Subsidiaries            
Reconciliation of the differences between statutory tax rate and effective tax rate            
Effective CIT rate (as a percent) 6.40% 8.20% (5.30%)      
Ctrip Computer Technology            
Reconciliation of the differences between statutory tax rate and effective tax rate            
Statutory CIT rate (as a percent)       15.00%    
Effective CIT rate (as a percent) (1.60%) 4.20% (1.40%)      
Ctrip Travel Information            
Reconciliation of the differences between statutory tax rate and effective tax rate            
Statutory CIT rate (as a percent)       15.00%    
Effective CIT rate (as a percent) (1.60%) 1.90% (0.40%)      
Ctrip Travel Network            
Reconciliation of the differences between statutory tax rate and effective tax rate            
Statutory CIT rate (as a percent)       15.00%    
Effective CIT rate (as a percent) (1.60%) 7.40% (3.00%)      
Chengdu Information Technology Co., Ltd.            
Reconciliation of the differences between statutory tax rate and effective tax rate            
Statutory CIT rate (as a percent)       15.00%    
Effective CIT rate (as a percent) (2.10%) 1.40% (0.60%)      
The Company and its subsidiaries in Hong Kong and Cayman            
Reconciliation of the differences between statutory tax rate and effective tax rate            
Statutory CIT rate (as a percent)       16.50%    
Statutory CIT rate alternate case (as a percent)       0.00%    
Effective CIT rate (as a percent) 15.40% 0.80% (0.30%)      
Qunar and subsidiaries            
Reconciliation of the differences between statutory tax rate and effective tax rate            
Statutory CIT rate (as a percent)       15.00%    
Effective CIT rate (as a percent) (1.00%) (5.90%)        
Other subsidiaries            
Reconciliation of the differences between statutory tax rate and effective tax rate            
Statutory CIT rate (as a percent)       16.50%    
Statutory CIT rate alternate case (as a percent)       15.00%    
Statutory CIT rate alternate case (as a percent)       0.00%    
Effective CIT rate (as a percent) (1.10%) (1.60%) 0.40%