Segment Information (Schedule of Business Segments) (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020		Sep. 30, 2019		Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales		$ 1,411		$ 1,586		$ 4,064		$ 4,865
Other (charges) gains, net (Note 14)		(10)		(7)		(37)		(101)
Operating profit (loss)		184		260		461		766
Equity in net earnings (loss) of affiliates		25		45		113		134
Depreciation and amortization		89		94		261		261
Capital expenditures		76	[1]	87	[1]	242	[2]	215	[2]
Goodwill and intangible assets, net		1,445				1,445				$ 1,386
Total assets		9,769				9,769				9,476
Increase (decrease) in accrued capital expenditures		4		5		(37)		(11)
Acetate Tow
Segment Reporting Information [Line Items]
Net sales		129		158		385		488
Acetyl Chain
Segment Reporting Information [Line Items]
Net sales	[3]	756		837		2,170		2,530
Engineered Materials
Segment Reporting Information [Line Items]
Net sales		526		591		1,509		1,847
Operating Segments [Member] | Acetate Tow
Segment Reporting Information [Line Items]
Net sales		129		158		385		488
Other (charges) gains, net (Note 14)		0		(3)		(1)		(87)
Operating profit (loss)		30		34		88		30
Equity in net earnings (loss) of affiliates		0		0		0		0
Depreciation and amortization		9		14		26		35
Capital expenditures		10		9		26		28
Goodwill and intangible assets, net		153				153				153
Total assets		944				944				977
Operating Segments [Member] | Acetyl Chain
Segment Reporting Information [Line Items]
Net sales		776		867		2,237		2,621
Other (charges) gains, net (Note 14)		1		0		6		(1)
Operating profit (loss)		121		180		377		570
Equity in net earnings (loss) of affiliates		2		1		3		3
Depreciation and amortization		41		43		122		119
Capital expenditures		37		47		118		108
Goodwill and intangible assets, net		286				286				234
Total assets		3,755				3,755				3,489
Operating Segments [Member] | Engineered Materials
Segment Reporting Information [Line Items]
Net sales		526		591		1,509		1,847
Other (charges) gains, net (Note 14)		(10)		(1)		(35)		6
Operating profit (loss)		84		111		173		358
Equity in net earnings (loss) of affiliates		21		41		100		123
Depreciation and amortization		34		33		100		96
Capital expenditures		21		23		73		60
Goodwill and intangible assets, net		1,006				1,006				999
Total assets		4,069				4,069				4,125
Corporate, Non-Segment [Member] | Other
Segment Reporting Information [Line Items]
Net sales		0		0		0		0
Other (charges) gains, net (Note 14)		(1)		(3)		(7)		(19)
Operating profit (loss)		(51)		(65)		(177)		(192)
Equity in net earnings (loss) of affiliates		2		3		10		8
Depreciation and amortization		5		4		13		11
Capital expenditures		8		8		25		19
Goodwill and intangible assets, net		0				0				0
Total assets		1,001				1,001				885
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales		(20)	[4]	(30)	[4]	(67)	[5]	(91)	[5]
Other (charges) gains, net (Note 14)		0		0		0		0
Operating profit (loss)		0		0		0		0
Equity in net earnings (loss) of affiliates		0		0		0		0
Depreciation and amortization		0		0		0		0
Capital expenditures		0		0		0		0
Goodwill and intangible assets, net		0				0				0
Total assets		0				0				$ 0
Eliminations [Member] | Acetyl Chain
Segment Reporting Information [Line Items]
Net sales		$ 20		$ 30		$ 67		$ 91

[1] Includes an increase in accrued capital expenditures of $4 million and $5 million for the three months ended September 30, 2020 and 2019, respectively.

[2] Includes a decrease in accrued capital expenditures of $37 million and $11 million for the nine months ended September 30, 2020 and 2019, respectively.

[3] Excludes intersegment sales of $20 million and $30 million for the three months ended September 30, 2020 and 2019, respectively. Excludes intersegment sales of $67 million and $91 million for the nine months ended September 30, 2020 and 2019, respectively.

[4] Includes intersegment sales primarily related to the Acetyl Chain.

[5] Includes intersegment sales primarily related to the Acetyl Chain.