Segment and Geographic Reporting Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 2,349	$ 2,484	$ 2,588	$ 2,300	$ 2,578	$ 2,815	$ 2,819	$ 2,364	$ 9,720	$ 10,576	$ 9,306
Other revenues from operations									666	647	743
Property, plant and equipment, net	4,541				4,688				4,541	4,688
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									9,271	10,170	8,897
Other revenues from operations									652	629	716
Property, plant and equipment, net	4,386				4,458				4,386	4,458
Other geographical locations
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									449	406	409
Other revenues from operations									14	18	$ 27
Property, plant and equipment, net	$ 155				$ 230				$ 155	$ 230