Segments (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			1
Number of reportable segments | segment			1
Net revenues by type:
Total consolidated net revenue	$ 2,422	$ 2,668	$ 4,905	$ 5,306
U.S.
Net revenues by type:
Total consolidated net revenue	1,199	1,304	2,425	2,600
United Kingdom
Net revenues by type:
Total consolidated net revenue	410	498	828	1,001
Germany
Net revenues by type:
Total consolidated net revenue	259	337	532	681
Rest of world
Net revenues by type:
Total consolidated net revenue	554	529	1,120	1,024
Operating Segments
Net revenues by type:
Total consolidated net revenue	2,422	2,668	4,905	5,306
Operating Segments | Net transaction revenues
Net revenues by type:
Total consolidated net revenue	2,297	2,496	4,652	4,972
Operating Segments | Marketing services and other revenues
Net revenues by type:
Total consolidated net revenue	$ 125	$ 172	$ 253	$ 334