Acquisitions, Dispositions and Plant Closures Plant Closures (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Asset impairments		$ 83	$ 0	$ 83	$ 0
Restructuring		(15)	(3)	(14)	(3)
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		(1)	$ 2	(1)	$ 2
Ocotlán, Mexico [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairments	[1]	83
Restructuring	[1]	(1)
Restructuring and Related Cost, Accelerated Depreciation		1
Plant Shutdown Costs		85
Restructuring and Related Cost, Expected Cost		$ 20		$ 20

[1] Included in Other (charges) gains, net in the consolidated statement of operations (Note 18).