Income Taxes - Schedule of Statutory Federal Income Tax Rate to Income from Continuing Operations Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense at the federal statutory rate of 21% for 2019 and 2018 and 35% for 2017	$ 163	$ 102	$ 146
Foreign tax rate differential	40	(42)	(82)
Federal research and development credit	(25)	(23)	(16)
Excess tax benefits related to stock-based compensation	(13)	(10)	(60)
Unrecognized tax benefits and related interest	17	23	27
Change in valuation allowance	(3)	8	4
Return to provision true-ups	(12)	(7)	1
trivago stock-based compensation	7	7	5
State taxes	22	11	3
Non-deductible goodwill impairment	0	16	0
Tax Act transition tax	0	0	144
U.S. statutory tax rate change	0	0	(158)
Global intangible low-taxed income	0	13	0
Foreign-derived intangible income	(14)	(38)	0
Other, net	21	27	31
Income tax expense	$ 203	$ 87	$ 45