Other (Charges) Gains, Net (Schedule of Other (Charges) Gains, Net) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Asset impairments	$ 83	$ 0	$ 83	$ 0
Restructuring	(15)	(3)	(14)	(3)
Other plant/office closures	0	0	(1)	0
Commercial disputes	0	0	4	0
Other (charges) gains, net	(98)	$ (3)	(94)	$ (3)
Engineered Materials [Member]
Restructuring Cost and Reserve [Line Items]
Commercial disputes			15
Other Activities [Member]
Restructuring Cost and Reserve [Line Items]
Commercial disputes			11
Employee Severance [Member]
Restructuring and Related Activities [Abstract]
Restructuring Reserve	15		15		$ 4
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			15
Payments for Restructuring			(3)
Restructuring Reserve, Accrual Adjustment			1
Restructuring Reserve, Foreign Currency Translation Gain (Loss)			0
Restructuring Reserve	15		15		4
Employee Severance [Member] | Engineered Materials [Member]
Restructuring and Related Activities [Abstract]
Restructuring Reserve	7		7		0
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			8
Payments for Restructuring			1
Restructuring Reserve, Accrual Adjustment			0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)			0
Restructuring Reserve	7		7		0
Employee Severance [Member] | Acetate Tow [Member]
Restructuring and Related Activities [Abstract]
Restructuring Reserve	1		1		2
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			1
Payments for Restructuring			2
Restructuring Reserve, Accrual Adjustment			0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)			0
Restructuring Reserve	1		1		2
Employee Severance [Member] | Acetyl Chain [Member]
Restructuring and Related Activities [Abstract]
Restructuring Reserve	2		2		2
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			1
Payments for Restructuring			0
Restructuring Reserve, Accrual Adjustment			1
Restructuring Reserve, Foreign Currency Translation Gain (Loss)			0
Restructuring Reserve	2		2		2
Employee Severance [Member] | Other Activities [Member]
Restructuring and Related Activities [Abstract]
Restructuring Reserve	5		5		0
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			5
Payments for Restructuring			0
Restructuring Reserve, Accrual Adjustment			0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)			0
Restructuring Reserve	$ 5		$ 5		$ 0