Segment Information (Schedule of Business Segments) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019		Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales		$ 1,193		$ 1,592		$ 2,653		$ 3,279
Other (charges) gains, net (Note 14)		(21)		(98)		(27)		(94)
Operating profit (loss)		83		186		277		506
Equity in net earnings (loss) of affiliates		31		39		88		89
Depreciation and amortization		87		84		172		167
Capital expenditures		80	[1]	74	[1]	166	[2]	128	[2]
Goodwill and intangible assets, net		1,415				1,415				$ 1,386
Total assets		9,506				9,506				9,476
Increase (decrease) in accrued capital expenditures		(8)		9		(41)		(16)
Acetate Tow
Segment Reporting Information [Line Items]
Net sales		127		164		256		330
Acetyl Chain
Segment Reporting Information [Line Items]
Net sales	[3]	646		835		1,414		1,693
Engineered Materials
Segment Reporting Information [Line Items]
Net sales		420		593		983		1,256
Operating Segments [Member] | Acetate Tow
Segment Reporting Information [Line Items]
Net sales		127		164		256		330
Other (charges) gains, net (Note 14)		0		(84)		(1)		(84)
Operating profit (loss)		31		(44)		58		(4)
Equity in net earnings (loss) of affiliates		0		0		0		0
Depreciation and amortization		9		11		17		21
Capital expenditures		6		11		16		19
Goodwill and intangible assets, net		152				152				153
Total assets		939				939				977
Operating Segments [Member] | Acetyl Chain
Segment Reporting Information [Line Items]
Net sales		662		865		1,461		1,754
Other (charges) gains, net (Note 14)		5		(1)		5		(1)
Operating profit (loss)		121		188		256		390
Equity in net earnings (loss) of affiliates		0		1		1		2
Depreciation and amortization		42		38		81		76
Capital expenditures		38		35		81		61
Goodwill and intangible assets, net		278				278				234
Total assets		3,549				3,549				3,489
Operating Segments [Member] | Engineered Materials
Segment Reporting Information [Line Items]
Net sales		420		593		983		1,256
Other (charges) gains, net (Note 14)		(25)		(8)		(25)		7
Operating profit (loss)		(13)		103		89		247
Equity in net earnings (loss) of affiliates		26		36		79		82
Depreciation and amortization		32		31		66		63
Capital expenditures		28		21		52		37
Goodwill and intangible assets, net		985				985				999
Total assets		4,009				4,009				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)		(5)		(6)		(16)
Operating profit (loss)		(56)		(61)		(126)		(127)
Equity in net earnings (loss) of affiliates		5		2		8		5
Depreciation and amortization		4		4		8		7
Capital expenditures		8		7		17		11
Goodwill and intangible assets, net		0				0				0
Total assets		1,009				1,009				885
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales		(16)	[4]	(30)	[4]	(47)	[5]	(61)	[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		$ 16		$ 30		$ 47		$ 61

[1] Includes a decrease in accrued capital expenditures of $8 million and an increase of $9 million for the three months ended June 30, 2020 and 2019, respectively.

[2] Includes a decrease in accrued capital expenditures of $41 million and $16 million for the six months ended June 30, 2020 and 2019, respectively.

[3] Excludes intersegment sales of $16 million and $30 million for the three months ended June 30, 2020 and 2019, respectively. Excludes intersegment sales of $47 million and $61 million for the six months ended June 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.