Other (Charges) Gains, Net (Schedule of Other (Charges) Gains, Net) (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)
Other plant/office closures	13	0	13	(50)
Other (charges) gains, net	12	0	9	(57)
Impairment of equity method investment	$ 0	0	$ 0	$ 4
Acetyl Intermediates [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		(50)
Contract Termination [Member] | Acetyl Intermediates [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		(24)
Non-income tax receivable adjustment [Member] | Acetyl Intermediates [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		$ (18)