Other (Charges) Gains, Net (Schedule of Other (Charges) Gains, Net) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring		$ (2)	$ (6)
Asset impairments		(1)	(4)
Plant/office closures		9	(1)
Commercial disputes		0	5
Total		6	(6)
Restructuring Reserve [Roll Forward]
Additions		2	$ 6
Employee Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring		(2)
Restructuring Reserve [Roll Forward]
Beginning balance		11
Additions		2
Cash payments		(3)
Ending balance		10
Employee Termination Benefits | Engineered Materials
Restructuring Cost and Reserve [Line Items]
Restructuring		(2)
Restructuring Reserve [Roll Forward]
Beginning balance		8
Additions		2
Cash payments		(2)
Ending balance		8
Employee Termination Benefits | Acetate Tow
Restructuring Cost and Reserve [Line Items]
Restructuring		0
Restructuring Reserve [Roll Forward]
Beginning balance		1
Additions		0
Cash payments		0
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		0
Restructuring Reserve [Roll Forward]
Beginning balance		2
Additions		0
Cash payments		(1)
Ending balance		1
Europe [Member] | Engineered Materials
Restructuring Cost and Reserve [Line Items]
Plant/office closures	[1]	$ 9

[1] Included in Other (charges) gains, net in the unaudited interim consolidated statement of operations (Note 12).