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PRINCIPAL ACCOUNTING POLICIES (Details 12) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based compensation arrangement by share-based payment award |  |  |
Number of shares, converted to RSU |  | 1,901,372 |
Outstanding at the beginning of the period (in dollars per share) |  |  |
Weighted average exercise price, outstanding, beginning balance (in dollars per share) | $ 64.81 | $ 85.02 | $ 67.71
Granted (in dollars per share) | $ 79.70 | $ 79.55 | $ 136.86
Exercised (in dollars per share) | $ 48.05 | $ 29.39 | $ 38.12
Forfeited (in dollars per share) | $ 91.75 | $ 136.67 | $ 115.98
Weighted average exercise price, outstanding, ending balance (in dollars per share) | $ 70.42 | $ 64.81 | $ 85.02
Total unrecognized compensation cost | $ 78,000,000 |  |
Weighted average recognized period | 2 years 7 months 6 days |  |
Restricted stock units (RSUs) |  |  |
Number of Shares |  |  |
Outstanding at the beginning of the period (in shares) | 646,301 | 190,916 |
Granted (in shares) | 259,365 | 164,976 | 188,407
Converted from option in January 2012 (in shares) |  | 475,343 |
Exercised (in shares) | (224,939) | (124,644) |
Forfeited (in shares) | (57,303) | (60,290) |
Outstanding at the end of the period (in shares) | 623,424 | 646,301 | 190,916
Outstanding at the beginning of the period (in dollars per share) |  |  |
Weighted average exercise price, outstanding, beginning balance (in dollars per share) | $ 101.30 | $ 130.29 |
Granted (in dollars per share) | $ 79.23 | $ 82.34 |
Exercised (in dollars per share) | $ 118.54 | $ 129.84 |
Forfeited (in dollars per share) | $ 85.40 | $ 128.27 |
Weighted average exercise price, outstanding, ending balance (in dollars per share) | $ 83.60 | $ 101.30 | $ 130.29
Share-based compensation expense | 13,200,000 | 12,500,000 | 22,500,000
Total unrecognized compensation cost | $ 31,000,000 |  |
Weighted average recognized period | 2 years 3 months 18 days |  |
Ctrip 2007 Incentive Plan | Restricted stock units (RSUs) |  |  |
Share-based compensation arrangement by share-based payment award |  |  |
Requisite service period | 4 years |  |

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- Definition Represents the number of share options (or share units) converted during the current period. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-option equity instruments exercised by participants. + 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)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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