Business Segments - Geographic Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 15,475	$ 15,377	$ 15,158
Long-Lived Assets	7,259	7,451
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	6,692	6,678	6,724
Long-Lived Assets	2,734	2,750
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	762	766
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	1,883	1,874	1,853
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	6,900	6,825	$ 6,581
Long-Lived Assets	$ 3,763	$ 3,935