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PRINCIPAL ACCOUNTING POLICIES - Major VIEs and VIEs' subsidiaries (Details)	12 Months Ended
	Dec. 31, 2017 CNY (¥) item
Shanghai Ctrip Commerce | Two senior officers of the Company
Major variable interest entities and their subsidiaries
Number of officers | item	2
Shareholding percentage of VIE	100.00%
Registered capital of VIE	¥ 30,000,000
Shanghai Huacheng | Shanghai Ctrip Commerce
Major variable interest entities and their subsidiaries
Shareholding percentage of VIE	100.00%
Registered capital of VIE	¥ 100,000,000
Chengdu Ctrip | Two senior officers of the Company
Major variable interest entities and their subsidiaries
Number of officers | item	2
Shareholding percentage of VIE	100.00%
Registered capital of VIE	¥ 500,000,000
Qunar Beijing | Two senior officers of the Company
Major variable interest entities and their subsidiaries
Number of officers | item	2
Shareholding percentage of VIE	100.00%
Registered capital of VIE	¥ 11,000,000

X

- Definition

Number of officers with ownership interest in variable interest entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	ctrp_
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X

- Definition

Registered Capital of VIE.

+ References

No definition available.

+ Details

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X

- Definition

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.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685

+ Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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