Other (Charges) Gains, Net (Schedule of Other (Charges) Gains, Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring	$ (6)	$ 1
Asset impairments	(4)	0
Plant/office closures	(1)	(1)
Commercial disputes	5	4
Total	(6)	4
Restructuring Reserve [Roll Forward]
Additions	6	(1)
Engineered Materials
Restructuring Cost and Reserve [Line Items]
Commercial disputes		15
Other
Restructuring Cost and Reserve [Line Items]
Commercial disputes		$ 11
Employee Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring	(6)
Restructuring Reserve [Roll Forward]
Beginning balance	13
Additions	6
Cash payments	(6)
Ending balance	13
Employee Termination Benefits | Engineered Materials
Restructuring Cost and Reserve [Line Items]
Restructuring	(1)
Restructuring Reserve [Roll Forward]
Beginning balance	5
Additions	1
Cash payments	(2)
Ending balance	4
Employee Termination Benefits | Acetate Tow
Restructuring Cost and Reserve [Line Items]
Restructuring	0
Restructuring Reserve [Roll Forward]
Beginning balance	3
Additions	0
Cash payments	(2)
Ending balance	1
Employee Termination Benefits | Acetyl Chain
Restructuring Cost and Reserve [Line Items]
Restructuring	0
Restructuring Reserve [Roll Forward]
Beginning balance	0
Additions	0
Cash payments	0
Ending balance	0
Employee Termination Benefits | Other
Restructuring Cost and Reserve [Line Items]
Restructuring	(5)
Restructuring Reserve [Roll Forward]
Beginning balance	5
Additions	5
Cash payments	(2)
Ending balance	$ 8