Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stock-based compensation:
Stock-based compensation	$ 21	$ 32	$ 43	$ 61
Cost of revenue
Stock-based compensation:
Stock-based compensation	0	0	1	1
Selling and Marketing
Stock-based compensation:
Stock-based compensation	3	4	6	8
Technology and Content
Stock-based compensation:
Stock-based compensation	9	13	18	24
General and Administrative
Stock-based compensation:
Stock-based compensation	$ 9	$ 15	$ 18	$ 28