Segment and Geographic Information - Summary of Segment Information (Details) - USD ($)		3 Months Ended	12 Months Ended
		Jun. 30, 2020	Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue (Note 4)	[1]		$ 604,000,000		$ 1,560,000,000	$ 1,615,000,000
Adjusted EBITDA			(51,000,000)		438,000,000	422,000,000
Depreciation and amortization			(125,000,000)		(126,000,000)	(116,000,000)
Stock-based compensation			(109,000,000)		(124,000,000)	(118,000,000)
Restructuring and other related reorganization costs			(41,000,000)		(1,000,000)
Legal reserves and settlements						(5,000,000)
Impairment		$ 0	(3,000,000)	[2]	0	0
Operating income (loss)			(329,000,000)		187,000,000	183,000,000
Other income (expense), net			(40,000,000)		7,000,000	(10,000,000)
Income (loss) before income taxes			(369,000,000)		194,000,000	173,000,000
(Provision) benefit for income taxes			80,000,000		(68,000,000)	(60,000,000)
Net income (loss)			(289,000,000)		126,000,000	113,000,000
Hotels, Media & Platform
Segment Reporting Information [Line Items]
Revenue (Note 4)	[1]		361,000,000		939,000,000	1,001,000,000
Experiences & Dining Segment
Segment Reporting Information [Line Items]
Revenue (Note 4)	[1]		186,000,000		456,000,000	372,000,000
Other
Segment Reporting Information [Line Items]
Revenue (Note 4)			57,000,000		165,000,000	242,000,000
Adjusted EBITDA			15,000,000		55,000,000	45,000,000
Reportable Segments | Hotels, Media & Platform
Segment Reporting Information [Line Items]
Revenue (Note 4)	[3]		361,000,000		939,000,000	1,001,000,000
Adjusted EBITDA	[3]		13,000,000		378,000,000	329,000,000
Reportable Segments | Experiences & Dining Segment
Segment Reporting Information [Line Items]
Revenue (Note 4)			186,000,000		456,000,000	372,000,000
Adjusted EBITDA			(79,000,000)		5,000,000	48,000,000
Corporate and Unallocated
Segment Reporting Information [Line Items]
Depreciation and amortization			(125,000,000)		(126,000,000)	(116,000,000)
Stock-based compensation			(109,000,000)		(124,000,000)	(118,000,000)
Restructuring and other related reorganization costs			(41,000,000)		$ (1,000,000)
Legal reserves and settlements						$ (5,000,000)
Impairment			$ (3,000,000)

[1] Our revenue is recognized primarily at a point in time for all reported segments

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

[3] Includes allocated corporate general and administrative costs of $70 million, $69 million and $77 million and Tripadvisor-branded advertising expenses (primarily television advertising) of $10 million, $77 million and $122 million for the years ended December 31, 2020, 2019 and 2018, respectively.