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RELATED PARTY TRANSACTIONS AND BALANCES (Details) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 27, 2015 USD ($) | Oct. 27, 2015 CNY (¥) | Oct. 26, 2015 USD ($) | May 04, 2015 CNY (¥) | Mar. 12, 2015 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Oct. 26, 2015 CNY (¥)
RELATED PARTY TRANSACTIONS AND BALANCES |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of entrusted loan and interest to related parties |  |  |  |  |  |  | ¥ 1,820,911,519 |  |  |  |  |  |
Due from related parties, current |  |  |  |  |  |  | 787,603,986 |  |  |  | $ 57,448,327 | ¥ 373,776,048 |
Due from related parties, non-current |  |  |  |  |  |  | 599,913,241 |  |  |  | 33,560,296 | 218,353,359 |
Due to related parties, current |  |  |  |  |  |  | 837,421,345 |  |  |  | 64,322,406 | 418,500,869 |
Other payables and accruals |  |  |  |  |  |  | 2,849,821,247 |  |  |  | $ 783,338,681 | 5,096,636,473 |
eLong |  |  |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS AND BALANCES |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions from related parties |  |  |  |  |  | ¥ 573,127,860 | 261,139,916 |  | ¥ 7,191,870 |  |  |  |
Commissions to related parties |  |  |  |  |  | 243,783,254 | 85,780,819 |  | 9,532,316 |  |  |  |
Due from related parties, current |  |  |  |  |  |  | 132,381,883 |  |  |  |  | 152,825,748 |
Due to related parties, current |  |  |  |  |  |  | 506,461,015 |  |  |  |  | 273,480,768 |
Hanting |  |  |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS AND BALANCES |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions from related parties |  |  |  |  |  | 76,792,041 | 44,094,542 |  | 17,740,390 |  |  |  |
Homeinns and BTG |  |  |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS AND BALANCES |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions from related parties |  |  |  |  |  | 62,528,564 | 66,921,837 |  | 34,556,539 |  |  |  |
Baidu |  |  |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS AND BALANCES |  |  |  |  |  |  |  |  |  |  |  |  |
Loan and interest to related parties | $ 100,000,000 | ¥ 650,000,000 |  |  |  |  |  |  |  |  |  |  |
Repayment of entrusted loan and interest from related parties |  |  |  |  |  |  | 652,299,803 |  |  |  |  |  |
Commissions to related parties |  |  |  |  |  | 80,474,320 | 96,056,853 |  |  |  |  |  |
Online marketing service from related parties |  |  |  |  |  | 38,015,114 | 110,064,311 |  | 89,244,042 |  |  |  |
Repayment of entrusted loan and interest to related parties |  |  |  |  |  |  | 1,837,384,234 |  |  |  |  |  |
Term of the loan | 12 months | 12 months |  |  |  |  |  |  |  |  |  |  |
Interest rate on loan (as a percent) | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |
Due from related parties, current |  |  |  |  |  |  | 408,834,667 |  |  |  |  | 118,564,122 |
Due to related parties, current |  |  |  |  |  |  | 293,579,066 |  |  |  |  | 58,287,646 |
Baidu | Qunar |  |  |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS AND BALANCES |  |  |  |  |  |  |  |  |  |  |  |  |
Loan and interest to related parties |  |  |  |  |  |  |  | $ 100,000,000 | ¥ 650,000,000 |  |  |  |
Term of the loan |  |  |  |  |  |  |  | 1 year | 1 year |  |  |  |
Outstanding balance related to business cooperation agreement |  |  |  |  |  |  | 409,000,000 |  |  |  |  | 119,000,000 |
Debt instrument term |  |  |  |  |  |  |  | 3 years | 3 years |  |  |  |
Principal loan amount |  |  |  |  |  |  |  |  | ¥ 1,100,000,000 |  |  |  |
Skysea |  |  |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS AND BALANCES |  |  |  |  |  |  |  |  |  |  |  |  |
Loan and interest to related parties |  |  |  |  |  | 4,346,586 | 73,399,675 |  | 15,826,363 | $ 80,000,000 |  |  |
Interest rate on loan (as a percent) |  |  |  |  |  |  |  |  |  | 3.00% |  |  |
Provision for the loan and receivable |  |  |  |  |  |  |  |  |  |  |  | 536,000,000 |
Due from related parties, current |  |  |  |  |  |  | 132,035,460 |  |  |  |  |  |
Due from related parties, non-current |  |  |  |  |  |  | 599,913,241 |  |  |  |  | 195,615,163 |
Other payables and accruals |  |  |  |  |  |  |  |  |  |  |  | 367,000,000 |
LY.com |  |  |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS AND BALANCES |  |  |  |  |  |  |  |  |  |  |  |  |
Commissions to related parties |  |  |  |  |  | ¥ 70,208,452 | 62,150,144 |  | ¥ 75,297,659 |  |  |  |
Due from related parties, current |  |  |  |  |  |  | 96,308,665 |  |  |  |  | 57,808,027 |
Others |  |  |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS AND BALANCES |  |  |  |  |  |  |  |  |  |  |  |  |
Due from related parties, current |  |  |  |  |  |  | 18,043,311 |  |  |  |  | 44,578,151 |
Due from related parties, non-current |  |  |  |  |  |  |  |  |  |  |  | 22,738,196 |
Due to related parties, current |  |  |  |  |  |  | ¥ 37,381,264 |  |  |  |  | ¥ 86,732,455 |
Baidu Times | Qunar |  |  |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS AND BALANCES |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on loan (as a percent) |  |  | 4.14% |  |  |  |  |  |  |  |  |  |
Loan granted by related parties |  |  | $ 99,000,000 |  |  |  |  |  |  |  |  |  | ¥ 640,000,000
Debt instrument term |  |  | 12 months |  |  |  |  |  |  |  |  |  |
Revolving credit facility agreement | Qunar |  |  |  |  |  |  |  |  |  |  |  |  |
RELATED PARTY TRANSACTIONS AND BALANCES |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  | ¥ 627,000,000 | ¥ 507,000,000 |  |  |  |  |  |  |  |

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