Acquisitions, Dispositions and Plant Closures Plant Closures (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Asset impairments		$ 0	$ 0	$ 83	$ 0
Restructuring		6	1	20	4
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		3	$ 2	2	$ 4
Ocotlán, Mexico [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairments	[1]			83
Restructuring	[1]			3
Restructuring and Related Cost, Accelerated Depreciation				7
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property				1
Other plant shutdown costs				1
Plant Shutdown Costs				95
Restructuring and Related Cost, Expected Cost		$ 12		$ 12

[1] Included in Other (charges) gains, net in the unaudited interim consolidated statement of operations (Note 14).