Segment and Geographic Reporting Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 2,578	$ 2,815	$ 2,820	$ 2,363	$ 2,385	$ 2,334	$ 2,277	$ 2,310	$ 10,576	$ 9,306	$ 7,740
Other revenues from operations									647	743	840
Property, plant and equipment, net	4,703				5,186				4,703	5,186
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									10,172	8,893	7,412
Other revenues from operations									629	716	791
Property, plant and equipment, net	4,432				4,776				4,432	4,776
Other geographical locations
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									404	413	328
Other revenues from operations									18	27	$ 49
Property, plant and equipment, net	$ 271				$ 410				$ 271	$ 410