Goodwill and Intangible Assets, Net - Additional Information (Details) - USD ($)		3 Months Ended	12 Months Ended
	Oct. 01, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Impairment of intangible assets			$ 0	$ 42,000,000	$ 0
Impairment of goodwill			0	86,000,000	$ 0
Intangible assets with indefinite lives			1,284,000,000	1,400,000,000
Intangible assets with definite lives, net			$ 520,000,000	592,000,000
Definite lived intangible assets, estimated useful life			1 year
Restatement Adjustment
Goodwill [Line Items]
Intangible assets with indefinite lives			$ (113,000,000)
Intangible assets with definite lives, net			$ 113,000,000
Definite lived intangible assets, estimated useful life			7 years
Core OTA
Goodwill [Line Items]
Impairment of intangible assets	$ 42,000,000
Impairment of goodwill				86,000,000
Accumulated goodwill impairment loss			$ 2,600,000,000	2,600,000,000
Reporting Unit Within Core Online Travel Companies | Nonrecurring Basis
Goodwill [Line Items]
Impairment of goodwill	$ 25,000,000	$ 61,000,000		$ 86,000,000