Segment and Geographic Area Information - Net Revenues to External Customers by Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets
Net revenues	$ 33,266	$ 32,753	$ 28,216
United States
Revenues from External Customers and Long-Lived Assets
Net revenues	23,907	21,524	18,251
Japan
Revenues from External Customers and Long-Lived Assets
Net revenues	1,211	1,591	764
Germany
Revenues from External Customers and Long-Lived Assets
Net revenues	909	1,292	1,157
Canada
Revenues from External Customers and Long-Lived Assets
Net revenues	813	730	659
France
Revenues from External Customers and Long-Lived Assets
Net revenues	695	783	730
Spain
Revenues from External Customers and Long-Lived Assets
Net revenues	472	611	521
United Kingdom
Revenues from External Customers and Long-Lived Assets
Net revenues	372	855	807
Italy
Revenues from External Customers and Long-Lived Assets
Net revenues	372	652	475
Brazil
Revenues from External Customers and Long-Lived Assets
Net revenues	359	350	410
The Netherlands
Revenues from External Customers and Long-Lived Assets
Net revenues	163	352	362
All other countries
Revenues from External Customers and Long-Lived Assets
Net revenues	$ 3,993	$ 4,013	$ 4,080