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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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-Publisher FASB
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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- References

No definition available.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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-Topic 230
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-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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Period Type:	duration

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_BusinessAcquisitionAxis=ctrp_B2BHotelReservationCompanyMember
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Name:	us-gaap_BusinessAcquisitionAxis=ctrp_WholesalerOperatedHotelReservationAndAirTicketingServicesMember
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Name:	us-gaap_BusinessAcquisitionAxis=ctrp_OnlineTripPackageServiceMember
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Name:	us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksMember
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Balance Type:
Period Type:

Name:	us-gaap_BusinessAcquisitionAxis=ctrp_OfflineTravelAgencyMember
Namespace Prefix:
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