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Related Party Transactions - Additional Information (Details) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class B Common Stock
Related Party Transaction [Line Items]
Right to voting	10 votes per share
LTRIP
Related Party Transaction [Line Items]
Beneficially ownership of shares of common stock	18.2
Percentage taken from outstanding shares of common stock	14.60%
Percentage of beneficially ownership of shares of common stock class B	22.50%
Right to voting	one vote per share
Beneficially ownership of equity securities	57.90%
Related party transactions	$ 0	$ 0	$ 0
LTRIP | Class B Common Stock
Related Party Transaction [Line Items]
Beneficially ownership of shares of common stock	12.8
Percentage taken from outstanding shares of common stock	100.00%
Right to voting	ten votes per share

X

- Definition

Number of common stock shares held by related party.

+ References

No definition available.

+ Details

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Namespace Prefix:	trip_
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Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of common stock owned by a related party.

+ References

No definition available.

+ Details

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Namespace Prefix:	trip_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

The percentage of common stock owned by a related party if Class B shares were converted to common shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	trip_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The voting rights percentage assuming the related party voted both common and class B stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	trip_
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X

- Definition

Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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X

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

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Balance Type:	debit
Period Type:	duration

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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.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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