Represents information pertaining to ratio of American depository shares ("ADSs") to ordinary shares.

No definition available.

Name:	tcom_AmericanDepositorySharesToOrdinarySharesRatio
Namespace Prefix:	tcom_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Share based payment award number of common stock issuable on vesting of outstanding restricted stock ratio.

+ References

No definition available.

+ Details

Name:	tcom_ShareBasedPaymentAwardNumberOfCommonStockIssuableOnVestingOfOutstandingRestrictedStockRatio
Namespace Prefix:	tcom_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based payment award number of common stock issuable on vesting of outstanding stock option ratio.

+ References

No definition available.

+ Details

Name:	tcom_ShareBasedPaymentAwardNumberOfCommonStockIssuableOnVestingOfOutstandingStockOptionRatio
Namespace Prefix:	tcom_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based payment award restricted stock shares subdivision conversion ratio.

+ References

No definition available.

+ Details

Name:	tcom_ShareBasedPaymentAwardRestrictedStockSubdivisionConversionRatio
Namespace Prefix:	tcom_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based payment award stock options subdivision conversion ratio.

+ References

No definition available.

+ Details

Name:	tcom_ShareBasedPaymentAwardStockOptionsSubdivisionConversionRatio
Namespace Prefix:	tcom_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Gross number of share options (or share units) granted during the period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770

+ Details

Name:	us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	tcom_ShareSubdivisionEventAxis=tcom_BeforeShareSubdivisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=tcom_EmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=tcom_Ctrip2007IncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	tcom_ShareSubdivisionEventAxis=tcom_AfterShareSubdivisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=tcom_GlobalShareIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

PRINCIPAL ACCOUNTING POLICIES - Share incentive plans (Details)		12 Months Ended
	Mar. 18, 2021	Dec. 31, 2022 shares	Dec. 31, 2021 shares	Dec. 31, 2020 shares	Dec. 31, 2019 shares
Share-based compensation disclosures
Number of options granted under share incentive plan		17,311,708	15,404,097	8,921,248
Number of option outstanding under share incentive plans (in shares)		77,474,702	66,081,119	57,583,856	54,368,896
Share subdivision ratio	8
Share based payment award number of common stock issuable on vesting of outstanding stock option ratio	1
Share based payment award number of common stock issuable on vesting of outstanding restricted stock ratio	1
Share based payment award stock options subdivision conversion ratio	8
Share Based Payment Award Restricted Stock Shares Subdivision Conversion Ratio	8
Before Share Subdivision
Share-based compensation disclosures
Ratio of ADSs to ordinary shares	1
Restricted stock units (RSUs) \| Employees
Share-based compensation disclosures
Requisite service period		4 years	4 years
Ctrip 2007 Incentive Plan \| Stock options \| Employees \| After Share Subdivision
Share-based compensation disclosures
Number of option outstanding under share incentive plans (in shares)		14,256,667	15,290,480
Ctrip 2007 Incentive Plan \| Restricted stock units (RSUs) \| Employees \| After Share Subdivision
Share-based compensation disclosures
Restricted stock units outstanding (in shares)		0	320
Global Incentive Plan \| Stock options \| Employees \| After Share Subdivision
Share-based compensation disclosures
Number of options granted under share incentive plan		17,311,708	15,404,097	8,921,248
Number of option outstanding under share incentive plans (in shares)		63,218,035	50,790,639
Global Incentive Plan \| Restricted stock units (RSUs) \| Employees \| After Share Subdivision
Share-based compensation disclosures
Number of options granted under share incentive plan		255,000	255,004	550,888
Restricted stock units outstanding (in shares)		751,506	869,300