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PRINCIPAL ACCOUNTING POLICIES - Share incentive plans (Details) - shares | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based compensation disclosures |  |  |  |  |
Number of option outstanding under share incentive plans (in shares) |  | 4,710,758 | 5,532,515 | 5,005,461 | 4,972,178
Number of options granted under share incentive plan |  | 631,166 | 937,002 | 625,006 |
Ctrip 2005 Option Plan |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |
Number of option outstanding under share incentive plans (in shares) |  | 0 | 107,572 |  |
Ctrip 2007 Incentive Plan |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |
Number of option outstanding under share incentive plans (in shares) |  | 4,367,099 | 5,424,943 |  |
Ctrip 2007 Incentive Plan | Outstanding weighted average stock options | Employees |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |
Vesting period |  | 4 years |  |  |
Number of options granted under share incentive plan |  | 138,061 | 937,002 |  |
Ctrip 2007 Incentive Plan | Restricted stock units (RSUs) |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |
Requisite service period |  | 4 years |  |  |
Restriction period |  | 4 years |  |  |
Restricted stock units outstanding (in shares) |  | 1,095,722 | 1,462,239 |  |
Global Incentive Plan | Outstanding weighted average stock options | Employees |  |  |  |  |
Share-based compensation disclosures |  |  |  |  |
Number of option outstanding under share incentive plans (in shares) |  | 343,659 |  |  |
Number of options granted under share incentive plan | 493,105 |  |  |  |
Requisite service period | 4 years |  |  |  |

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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