Segment and Geographic Area Information - Net Revenues to External Customers by Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets
Net revenues	$ 45,804	$ 33,266	$ 32,753
United States
Revenues from External Customers and Long-Lived Assets
Net revenues	34,879	23,907	21,524
Japan
Revenues from External Customers and Long-Lived Assets
Net revenues	1,198	1,211	1,591
Canada
Revenues from External Customers and Long-Lived Assets
Net revenues	1,159	813	730
Germany
Revenues from External Customers and Long-Lived Assets
Net revenues	1,049	909	1,292
France
Revenues from External Customers and Long-Lived Assets
Net revenues	797	695	783
Australia
Revenues from External Customers and Long-Lived Assets
Net revenues	527	395	350
United Kingdom
Revenues from External Customers and Long-Lived Assets
Net revenues	509	372	855
China
Revenues from External Customers and Long-Lived Assets
Net revenues	471	195	152
Spain
Revenues from External Customers and Long-Lived Assets
Net revenues	453	472	611
Brazil
Revenues from External Customers and Long-Lived Assets
Net revenues	406	359	350
Italy
Revenues from External Customers and Long-Lived Assets
Net revenues	379	372	652
All other countries
Revenues from External Customers and Long-Lived Assets
Net revenues	$ 3,977	$ 3,566	$ 3,863