Other (Charges) Gains, Net (Schedule of Other (Charges) Gains, Net) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($) manufacturingSite
Restructuring Cost and Reserve [Line Items]
Number of manufacturing sites | manufacturingSite				3
Restructuring	$ (9)	$ (6)	$ (17)	$ (20)
Asset impairments	(2)	0	(31)	(83)
Plant/office closures	1	(1)	6	(2)
Commercial disputes	0	0	6	4
European Commission investigation	0	0	(2)	0
Other	0	0	1	0
Total	(10)	(7)	(37)	(101)
Restructuring Reserve [Roll Forward]
Additions	9	$ 6	17	20
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			(20)
Restructuring Reserve [Roll Forward]
Beginning balance			13
Additions			20
Cash payments			(17)
Other changes			(3)
Ending balance	13		13
Employee Termination Benefits | Engineered Materials
Restructuring Cost and Reserve [Line Items]
Restructuring			(11)
Restructuring Reserve [Roll Forward]
Beginning balance			5
Additions			11
Cash payments			(5)
Other changes			(2)
Ending balance	9		9
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)
Other changes			0
Ending balance	1		1
Employee Termination Benefits | Acetyl Chain
Restructuring Cost and Reserve [Line Items]
Restructuring			(1)
Restructuring Reserve [Roll Forward]
Beginning balance			0
Additions			1
Cash payments			(1)
Other changes			0
Ending balance	0		0
Employee Termination Benefits | Other
Restructuring Cost and Reserve [Line Items]
Restructuring			(8)
Restructuring Reserve [Roll Forward]
Beginning balance			5
Additions			8
Cash payments			(9)
Other changes			(1)
Ending balance	$ 3		3
Lebanon, Tennessee [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairments			(4)
Europe [Member] | Engineered Materials
Restructuring Cost and Reserve [Line Items]
Asset impairments			$ (26)