Goodwill and Intangible Assets, Net - Additional Information (Details)	3 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) ReportingUnit	Dec. 31, 2020 USD ($)		Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill And Intangible Assets [Line Items]
Number of distinct reporting units | ReportingUnit		4
Impairment of goodwill (Note 8)		$ 0	$ 3,000,000	[1]	$ 0	$ 0
Accumulated goodwill impairment losses			3,000,000
Amortization expense			26,000,000		33,000,000	34,000,000
Impairment of indefinite-lived intangible assets			0
Impairment of intangible assets			$ 0		$ 0	$ 0
China
Goodwill And Intangible Assets [Line Items]
Impairment of goodwill (Note 8)	$ 3,000,000

[1] Represents a goodwill impairment charge related to our Tripadvisor China reporting unit.