Other (Charges) Gains, Net (Schedule of Other (Charges) Gains, Net) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of manufacturing sites	3
Restructuring	$ (2)	$ (15)	$ (8)	$ (14)
Asset impairments	(25)	(83)	(29)	(83)
Plant/office closures	6	0	5	(1)
Commercial disputes	1	0	6	4
European Commission investigation	(2)	0	(2)	0
Other	1	0	1	0
Total	(21)	(98)	(27)	(94)
Restructuring Reserve [Roll Forward]
Additions	2	$ 15	8	14
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			(11)
Restructuring Reserve [Roll Forward]
Beginning balance			13
Additions			11
Cash payments			(11)
Other changes			(3)
Ending balance	10		10
Employee Termination Benefits | Engineered Materials
Restructuring Cost and Reserve [Line Items]
Restructuring			(3)
Restructuring Reserve [Roll Forward]
Beginning balance			5
Additions			3
Cash payments			(3)
Other changes			(2)
Ending balance	3		3
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			(7)
Restructuring Reserve [Roll Forward]
Beginning balance			5
Additions			7
Cash payments			(5)
Other changes			(1)
Ending balance	$ 6		6
Lebanon, Tennessee [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairments			$ 4