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PRINCIPAL ACCOUNTING POLICIES (Details 12) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2012 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Share-based compensation arrangement by share-based payment award |  |  |  |
Number of shares, converted to RSU | 1,901,372 |  |  |
Number of Shares |  |  |  |
Total unrecognized compensation cost |  | $ 153 |  |
Weighted average recognized period |  | 2 years 8 months 12 days |  |
Restricted stock units (RSUs) |  |  |  |
Share-based compensation arrangement by share-based payment award |  |  |  |
Number of RSUs, replaced options | 475,343 |  |  |
Number of Shares |  |  |  |
Granted (in shares) |  | 229,603 | 557,008 |
Share-based compensation expense |  | $ 35 | $ 22 |
Total unrecognized compensation cost |  |  |  | $ 147
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 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: 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 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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