Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenue	$ 506	$ 504	$ 975	$ 1,040
Cost of revenue	104	97	196	189
Gross profit	402	407	779	851
Operating expenses:
Sales and marketing	173	163	329	337
Technology and development	140	119	277	227
General and administrative	153	120	276	232
Impairment and restructuring costs	2	0	8	14
Acquisition-related costs	1	0	1	0
Total operating expenses	469	402	891	810
Income (loss) from continuing operations	(67)	5	(112)	41
Other income	42	5	74	7
Interest expense	(9)	(9)	(18)	(17)
Income (loss) from continuing operations before income taxes	(34)	1	(56)	31
Income tax benefit (expense)	(1)	9	(1)	4
Net income (loss) from continuing operations	(35)	10	(57)	35
Net loss from discontinued operations, net of income taxes	0	(2)	0	(11)
Net income (loss)	$ (35)	$ 8	$ (57)	$ 24
Net income (loss) from continuing operations per share:
Basic (USD per share)	$ (0.15)	$ 0.04	$ (0.24)	$ 0.14
Diluted (usd per share)	(0.15)	0.04	(0.24)	0.13
Net income (loss) per share:
Basic (usd per share)	(0.15)	0.03	(0.24)	0.10
Diluted (usd per share)	$ (0.15)	$ 0.03	$ (0.24)	$ 0.09
Weighted-average shares outstanding:
Basic (in shares)	233,629	243,942	234,023	246,229
Diluted (in shares)	233,629	245,163	234,023	248,544