Segment Reporting - Net Revenues by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net revenues	$ 7,298	$ 6,665	$ 5,911	$ 6,707	$ 6,913	$ 6,355	$ 6,062	$ 6,538	$ 26,581	$ 25,868	$ 25,938
United States
Segment Reporting Information [Line Items]
Net revenues									7,130	6,625	6,401
Other
Segment Reporting Information [Line Items]
Net revenues									$ 19,451	$ 19,243	$ 19,537