Business Description and Basis of Presentation - Additional Information (Details) shares in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021 USD ($) Market Vote / shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) Market Vote / shares shares	Jun. 30, 2020 USD ($)
Description Of Business And Basis Of Presentation [Line Items]
Number of markets with localized versions of website | Market	40			40
Restructuring and other related reorganization costs		$ 33,000,000			$ 42,000,000
Employee Severance and Related Benefits
Description Of Business And Basis Of Presentation [Line Items]
Restructuring and other related reorganization costs		33,000,000	$ 9,000,000
Liberty Tripadvisor Holdings, Inc.
Description Of Business And Basis Of Presentation [Line Items]
Beneficially ownership of shares of common stock | shares				16.4
Percentage taken from outstanding shares of common stock				13.20%
Percentage of beneficially ownership of shares of common stock class B				21.30%
Right to voting				one vote per share
Vote per common stock share | Vote / shares	1			1
Beneficially ownership of equity securities				57.20%
Related party transactions	$ 0	$ 0		$ 0	$ 0
Liberty Tripadvisor Holdings, Inc. | Class B Common Stock
Description Of Business And Basis Of Presentation [Line Items]
Beneficially ownership of shares of common stock | shares				12.8
Percentage taken from outstanding shares of common stock				100.00%
Right to voting				ten votes per share
Vote per common stock share | Vote / shares	10			10