Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue (Note 3)	[1]	$ 123	$ 278
Costs and expenses:
Cost of revenue	[2]	12	19
Selling and marketing	[3]	73	125
Technology and content	[3]	55	69
General and administrative	[3]	38	51
Depreciation and amortization		29	32
Restructuring and other related reorganization costs			9
Total costs and expenses		207	305
Operating income (loss)		(84)	(27)
Other income (expense):
Interest expense		(11)	(2)
Interest income			1
Other income (expense), net		(1)	1
Total other income (expense), net		(12)
Income (loss) before income taxes		(96)	(27)
(Provision) benefit for income taxes (Note 6)		16	11
Net income (loss)		$ (80)	$ (16)
Earnings (loss) per share attributable to common stockholders (Note 10):
Basic		$ (0.59)	$ (0.12)
Diluted		$ (0.59)	$ (0.12)
Weighted average common shares outstanding (Note 10):
Basic		135,746	136,240
Diluted		135,746	136,240

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

[2] Excludes amortization as follows:

[3] Includes stock-based compensation expense as follows (Note 8):