Income Taxes - Summary of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Stock-based compensation	$ 31	$ 47
Net operating loss carryforwards	81	49
Provision for accrued expenses	4	6
Lease financing obligation	23	24
Foreign advertising spend	15	15
Interest carryforward	32	20
Other	20	14
Total deferred tax assets	206	175
Less: valuation allowance	(106)	(72)
Net deferred tax assets	100	103
Deferred tax liabilities:
Intangible assets	(53)	(51)
Property and equipment	(24)	(27)
Prepaid expenses	(2)	(2)
Building - corporate headquarters	(20)	(22)
Other	(1)	(2)
Total deferred tax liabilities	$ (100)	(104)
Net deferred tax liability		$ (1)