Acquisitions, Dispositions and Plant Closures Plant Closures (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring		$ 1	$ 0	$ 4	$ 3
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		(2)	$ (1)	(4)	$ (4)
Ocotlán, Mexico [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	[1]			2
Restructuring and Related Cost, Accelerated Depreciation				12
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property				(1)
Plant Shutdown Costs				15
Restructuring and Related Cost, Expected Cost		$ 5		$ 5

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