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PRINCIPAL ACCOUNTING POLICIES - Statutory reserves (Details) - China	12 Months Ended
	Dec. 31, 2022
Statutory reserves disclosures
Portion of after-tax profit to be allocated to general reserve under PRC law (as a percent)	10.00%
Maximum percentage of statutory general reserve related to entity's registered capital	50.00%

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- Definition

For entities incorporated in PRC or its province, the minimum percentage of the after-tax net income allocated to a statutory reserve until the reserve balance is a specified percentage of the registered capital.

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No definition available.

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- Definition

For entities incorporated in PRC, the ratio of the statutory reserve to the registered capital which triggers the elimination of the requirement to contribute to the statutory reserve.

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No definition available.

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Namespace Prefix:	tcom_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Schedule of Statutory Reserves [Line Items]

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No definition available.

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Namespace Prefix:	tcom_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	srt_StatementGeographicalAxis=country_CN
Namespace Prefix:
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Balance Type:
Period Type: