Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue (Note 3)	[1]	$ 59	$ 422	$ 337	$ 798
Costs and expenses:
Cost of revenue	[2],[3]	10	27	29	48
Selling and marketing	[3]	54	180	179	357
Technology and content	[3]	51	74	120	148
General and administrative	[3]	43	45	94	88
Depreciation and amortization		32	30	64	61
Restructuring and other related reorganization costs (Note 10)		33		42
Total costs and expenses:		223	356	528	702
Operating income (loss)		(164)	66	(191)	96
Other income (expense):
Interest expense		(7)	(2)	(9)	(3)
Interest income		1	5	2	9
Other income (expense), net (Note 14)		(9)	(1)	(9)	(1)
Total other income (expense), net		(15)	2	(16)	5
Income (loss) before income taxes		(179)	68	(207)	101
(Provision) benefit for income taxes (Note 9)		26	(34)	38	(41)
Net income (loss)		$ (153)	$ 34	$ (169)	$ 60
Earnings (loss) per share attributable to common stockholders (Note 4):
Basic		$ (1.14)	$ 0.24	$ (1.25)	$ 0.43
Diluted		$ (1.14)	$ 0.24	$ (1.25)	$ 0.43
Weighted average common shares outstanding (Note 4):
Basic		134,213	139,070	135,227	138,744
Diluted		134,213	140,805	135,227	141,037

[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 5):