Acquisitions and Other Investments - Additional Information (Details) $ in Millions		12 Months Ended
		Dec. 31, 2020 USD ($) Business	Dec. 31, 2019 USD ($) Business	Dec. 31, 2018 USD ($) Business
Acquisitions And Other Investments [Line Items]
Cash consideration paid, net of cash acquired		$ 4	$ 110	$ 24
Cost method investments			$ 2
Series of Individually Immaterial Business Acquisition
Acquisitions And Other Investments [Line Items]
Number of business acquired | Business		0	3	1
Acquisition-related costs expensed as incurred			$ 2
Total acquisition purchase price			109
Cash consideration paid, net of cash acquired			107	$ 23
Cash acquired from acquisition			2
Purchase price consideration	[1]		$ 109	$ 23
SinglePlatform
Acquisitions And Other Investments [Line Items]
Percentage of ownership interests acquired			100.00%
Date of acquisition			Dec. 31, 2019
BookaTable
Acquisitions And Other Investments [Line Items]
Percentage of ownership interests acquired			100.00%
Date of acquisition			Dec. 31, 2019
Restorando
Acquisitions And Other Investments [Line Items]
Percentage of ownership interests acquired			100.00%
Date of acquisition			Feb. 28, 2019

[1] Subject to adjustment based on indemnification obligations for general representations and warranties of certain acquired company stockholders.