Segment Information (Schedule of Business Segments) (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
Segment Reporting Information [Line Items]
Net sales		$ 1,592		$ 1,844		$ 3,279		$ 3,695
Other (charges) gains, net (Note 14)		(98)		(3)		(94)		(3)
Operating profit (loss)		(186)		(358)		(506)		(701)
Equity in net earnings (loss) of affiliates		39		56		89		114
Depreciation and amortization		84		86		167		165
Capital expenditures		74	[1]	88	[1]	128	[2]	145	[2]
Goodwill and intangible assets, net		1,410				1,410				$ 1,367
Total assets		9,506				9,506				9,313
Increase (decrease) in accrued capital expenditures		9		9		(16)		(20)
Acetate Tow [Member]
Segment Reporting Information [Line Items]
Net sales		164		162		330		330
Acetyl Chain [Member]
Segment Reporting Information [Line Items]
Net sales	[3]	835		1,018		1,693		2,036
Engineered Materials [Member]
Segment Reporting Information [Line Items]
Net sales		593		664		1,256		1,329
Operating Segments [Member] | Acetate Tow [Member]
Segment Reporting Information [Line Items]
Net sales		164		162		330		330
Other (charges) gains, net (Note 14)		(84)		(1)		(84)		(1)
Operating profit (loss)		44		(39)		4		(85)
Equity in net earnings (loss) of affiliates		0		0		0		0
Depreciation and amortization		11		13		21		23
Capital expenditures		11		10		19		10
Goodwill and intangible assets, net		153				153				153
Total assets		973				973				1,032
Operating Segments [Member] | Acetyl Chain [Member]
Segment Reporting Information [Line Items]
Net sales		865		1,049		1,754		2,100
Other (charges) gains, net (Note 14)		(1)		(2)		(1)		(2)
Operating profit (loss)		(188)		(273)		(390)		(526)
Equity in net earnings (loss) of affiliates		1		2		2		3
Depreciation and amortization		38		36		76		71
Capital expenditures		35		49		61		83
Goodwill and intangible assets, net		237				237				240
Total assets		3,503				3,503				3,471
Operating Segments [Member] | Engineered Materials [Member]
Segment Reporting Information [Line Items]
Net sales		593		664		1,256		1,329
Other (charges) gains, net (Note 14)		(8)		0		7		0
Operating profit (loss)		(103)		(114)		(247)		(241)
Equity in net earnings (loss) of affiliates		36		53		82		107
Depreciation and amortization		31		33		63		65
Capital expenditures		21		26		37		47
Goodwill and intangible assets, net		1,020				1,020				974
Total assets		3,589				3,589				4,012
Corporate, Non-Segment [Member] | Other Activities [Member]
Segment Reporting Information [Line Items]
Net sales		0		0		0		0
Other (charges) gains, net (Note 14)		(5)		0		(16)		0
Operating profit (loss)		61		68		127		151
Equity in net earnings (loss) of affiliates		2		1		5		4
Depreciation and amortization		4		4		7		6
Capital expenditures		7		3		11		5
Goodwill and intangible assets, net		0				0				0
Total assets		1,441				1,441				798
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales		(30)	[4]	(31)	[4]	(61)	[5]	(64)	[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 [Member]
Segment Reporting Information [Line Items]
Net sales		$ 30		$ 31		$ 61		$ 64

[1] Includes an increase in accrued capital expenditures of $9 million and $9 million for the three months ended June 30, 2019 and 2018, respectively.

[2] Includes a decrease in accrued capital expenditures of $16 million and $20 million for the six months ended June 30, 2019 and 2018, respectively.

[3] Excludes intersegment sales of $30 million and $31 million for the three months ended June 30, 2019 and 2018, respectively. Excludes intersegment sales of $61 million and $64 million for the six months ended June 30, 2019 and 2018, respectively.

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

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