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PRINCIPAL ACCOUNTING POLICIES - Summary of RSUs activities (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Weighted Average Exercise Price
Outstanding, beginning (in dollars per share)	$ 157.82	$ 122.00	$ 101.03
Granted (in dollars per share)	43.03	322.20	247.91
Exercised (in dollars per share)	68.95	80.70	65.65
Forfeited (in dollars per share)	133.92	199.32	156.32
Outstanding, ending (in dollars per share)	$ 168.80	$ 157.82	$ 122.00
Unrecognized compensation cost	$ 262.0
Weighted average recognized period	2 years 8 months 12 days
Restricted stock units (RSUs)
Number of Shares
Outstanding at the beginning of the period (in shares)	1,462,239	865,408	1,058,608
Granted (in shares)	15,664	1,183,094	229,603
Vested (in shares)	(285,375)	(492,825)	(271,683)
Forfeited (in shares)	(96,806)	(93,438)	(151,120)
Outstanding at the end of the period (in shares)	1,095,722	1,462,239	865,408
Weighted Average Exercise Price
Outstanding, beginning (in dollars per share)	$ 263.28	$ 185.17	$ 158.55
Granted (in dollars per share)	323.92	301.62	249.31
Exercised (in dollars per share)	191.21	223.00	129.21
Forfeited (in dollars per share)	274.71	237.69	181.47
Outstanding, ending (in dollars per share)	$ 281.91	$ 263.28	$ 185.17
Share-based compensation expense	$ 281.9	$ 217.8	$ 48.6
Unrecognized compensation cost	$ 183.0
Weighted average recognized period	1 year 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 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.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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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).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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