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PRINCIPAL ACCOUNTING POLICIES - Major VIEs and their subsidiaries (Details)	12 Months Ended
	Dec. 31, 2022 CNY (¥) ¥ / item
Major variable interest entities and their subsidiaries
Description of foreign investment law approval	In March 2019, the draft Foreign Investment Law was submitted to the National People’s Congress for review and was approved on March 15, 2019, which came into effect from January 1, 2020
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	¥ 900,000,000
Shanghai Huacheng
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

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Description of foreign investment law approval.

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- Definition

Number of officers with ownership interest in variable interest entity.

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- Definition

Registered Capital of VIE.

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- 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.

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- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=123419778&loc=SL6759159-111685

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