Segment Reporting - Schedule of Segment Information by Geography (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues, less transaction-based expenses:	$ 7,146	$ 6,036	$ 5,202
Net assets	22,748	19,534
Property and equipment, net	1,699	1,713
United States
Segment Reporting Information [Line Items]
Revenues, less transaction-based expenses:	4,832	3,933	3,290
Net assets	14,628	11,351
Property and equipment, net	1,494	1,506
Foreign Countries
Segment Reporting Information [Line Items]
Revenues, less transaction-based expenses:	2,314	2,103	$ 1,912
Net assets	8,120	8,183
Property and equipment, net	$ 205	$ 207