Business Segments - Geographic Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 12,321	$ 14,745	$ 15,475
Long-Lived Assets	7,073	7,208
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	5,424	6,489	6,692
Long-Lived Assets	2,517	2,681
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	705	979	1,691
Long-Lived Assets	729	653
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	6,192	7,277	$ 7,092
Long-Lived Assets	3,085	3,152
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 742	$ 722