Segments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment	1
Number of reportable segments | segment	1
Net revenues by type:
Total consolidated net revenue	$ 2,483	$ 2,638
U.S.
Net revenues by type:
Total consolidated net revenue	1,226	1,296
United Kingdom
Net revenues by type:
Total consolidated net revenue	418	503
Germany
Net revenues by type:
Total consolidated net revenue	273	344
Rest of world
Net revenues by type:
Total consolidated net revenue	566	495
Operating Segments
Net revenues by type:
Total consolidated net revenue	2,483	2,638
Operating Segments | Net transaction revenues
Net revenues by type:
Total consolidated net revenue	2,355	2,476
Operating Segments | Marketing services and other revenues
Net revenues by type:
Total consolidated net revenue	$ 128	$ 162