Other (Charges) Gains, Net (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Other plant/office closures	$ 0	$ 53
Employee termination benefits	$ 0	2
Acetyl Intermediates [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		53
Acetyl Intermediates [Member] | Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		27
Acetyl Intermediates [Member] | Non-income tax receivable adjustment [Member]
Restructuring Cost and Reserve [Line Items]
Other plant/office closures		$ 18