Business Description and Basis of Presentation - Additional Information (Details) shares in Millions, Restaurant in Millions, Hotel in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020 USD ($) Market Language Hotel VacationRental Restaurant ActivityandAttraction Airline Cruise Vote / shares	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Market Language Hotel VacationRental Restaurant ActivityandAttraction Airline Cruise Vote / shares shares	Sep. 30, 2019 USD ($)	Jul. 09, 2020 USD ($)
Description Of Business And Basis Of Presentation [Line Items]
Number of markets with localized versions of website | Market	48			48
Number of languages worldwide | Language	28			28
Description of user-generated reviews and opinions across broad base of global travel-related businesses				Tripadvisor features 878 million reviews and opinions on 8.8 million places to stay, places to eat and things to do – including 1.5 million hotels, inns, B&Bs and specialty lodging, 790,000 rental properties, 4.7 million restaurants, 1.3 million travel activities and experiences worldwide, 500,000 airlines, and 30,000 cruises.
Number of hotels and accommodations | Hotel	1.5			1.5
Number of vacation rentals | VacationRental	790,000			790,000
Number of restaurants | Restaurant	4.7			4.7
Number of activities and attractions worldwide | ActivityandAttraction	1,300,000			1,300,000
Number of airlines | Airline	500,000			500,000
Number of cruises | Cruise	30,000			30,000
COVID-19 Pandemic
Description Of Business And Basis Of Presentation [Line Items]
Income tax expense (benefit) due to CARES Act	$ (3,000,000)			$ (22,000,000)
Government grants and other assistance benefits recognized	3,000,000			10,000,000
Government grants and other assistance benefits received				5,000,000
COVID-19 Pandemic | Prepaid Expenses and Other Current Assets
Description Of Business And Basis Of Presentation [Line Items]
Government grants and other assistance benefits receivable	5,000,000			5,000,000
Revolving Credit Facility | 2015 Credit Facility
Description Of Business And Basis Of Presentation [Line Items]
Amount borrowed		$ 700,000,000
7.000% senior notes due July 15, 2025
Description Of Business And Basis Of Presentation [Line Items]
Debt instrument, aggregate principal amount	$ 500,000,000			$ 500,000,000		$ 500,000,000
Liberty TripAdvisor Holdings, Inc.
Description Of Business And Basis Of Presentation [Line Items]
Beneficially ownership of shares of common stock | shares				18.2
Percentage taken from outstanding shares of common stock				14.90%
Percentage of beneficially ownership of shares of common stock class B				23.00%
Right to voting				one vote per share
Vote per common stock share | Vote / shares	1			1
Beneficially ownership of equity securities				58.50%
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