Segment Information (Schedule of Business Segments) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017		Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales		$ 1,844		$ 1,510		$ 3,695		$ 2,981
Other (charges) gains, net (Note 14)		(3)		(2)		(3)		(57)
Operating profit (loss)		358		218		701		388
Equity in net earnings (loss) of affiliates		56		38		114		85
Depreciation and amortization		86		75		165		146
Capital expenditures		88	[1]	58	[1]	145		99	[1]
Goodwill and intangible assets, net		1,394				1,394				$ 1,304
Total assets		9,789				9,789				9,538
Increase (decrease) in accrued capital expenditures		9		4		20		(17)
Acetate Tow [Member]
Segment Reporting Information [Line Items]
Net sales		162				330
Industrial Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	[2]	287				559
Acetyl Intermediates [Member]
Segment Reporting Information [Line Items]
Net sales	[3]	731				1,477
Engineered Materials [Member]
Segment Reporting Information [Line Items]
Net sales		664				1,329
Operating Segments [Member] | Consumer Specialties [Member]
Segment Reporting Information [Line Items]
Net sales		162		163		330		354
Other (charges) gains, net (Note 14)		(1)		1		(1)		(2)
Operating profit (loss)		39		41		85		103
Equity in net earnings (loss) of affiliates		0		0		0		0
Depreciation and amortization		13		10		23		20
Capital expenditures		10		7		10		13
Goodwill and intangible assets, net		154				154				154
Total assets		1,071				1,071				1,163
Operating Segments [Member] | Industrial Specialties [Member]
Segment Reporting Information [Line Items]
Net sales		288	[4]	262	[4]	562	[5]	507	[5]
Other (charges) gains, net (Note 14)		(2)		0		(2)		0
Operating profit (loss)		22		26		45		51
Equity in net earnings (loss) of affiliates		0		0		0		0
Depreciation and amortization		10		10		19		18
Capital expenditures		5		6		9		10
Goodwill and intangible assets, net		45				45				46
Total assets		850				850				861
Operating Segments [Member] | Acetyl Intermediates [Member]
Segment Reporting Information [Line Items]
Net sales		861	[6]	649	[6]	1,732	[7]	1,268	[7]
Other (charges) gains, net (Note 14)		0		(3)		0		(50)
Operating profit (loss)		251		109		482		136
Equity in net earnings (loss) of affiliates		2		2		3		3
Depreciation and amortization		26		26		52		52
Capital expenditures		44		28		74		48
Goodwill and intangible assets, net		202				202				202
Total assets		2,688				2,688				2,657
Operating Segments [Member] | Engineered Materials [Member]
Segment Reporting Information [Line Items]
Net sales		664		546		1,329		1,060
Other (charges) gains, net (Note 14)		0		2		0		(2)
Operating profit (loss)		114		105		241		209
Equity in net earnings (loss) of affiliates		53		38		107		81
Depreciation and amortization		33		27		65		52
Capital expenditures		26		14		47		24
Goodwill and intangible assets, net		993				993				902
Total assets		4,029				4,029				3,866
Corporate, Non-Segment [Member] | Other Activities [Member]
Segment Reporting Information [Line Items]
Net sales		0		0		0		0
Other (charges) gains, net (Note 14)		0		2		0		(3)
Operating profit (loss)		(68)		(63)		(151)		(111)
Equity in net earnings (loss) of affiliates		1		(2)		4		1
Depreciation and amortization		4		2		6		4
Capital expenditures		3		3		5		4
Goodwill and intangible assets, net		0				0				0
Total assets		1,151				1,151				991
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales		(131)		(110)		(258)		(208)
Other (charges) gains, net (Note 14)		0		0		0		0
Operating profit (loss)		0		0		(1)		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] | Industrial Specialties [Member]
Segment Reporting Information [Line Items]
Net sales		1		1		3		2
Eliminations [Member] | Acetyl Intermediates [Member]
Segment Reporting Information [Line Items]
Net sales		$ 130		$ 109		$ 255		$ 206

[1] Includes a decrease in accrued capital expenditures of $20 million and $17 million for the six months ended June 30, 2018 and 2017, respectively.

[2] Excludes intersegment sales of $1 million and $3 million for the three and six months ended June 30, 2018, respectively.

[3] Excludes intersegment sales of $130 million and $255 million for the three and six months ended June 30, 2018, respectively.

[4] Includes intersegment sales of $1 million and $1 million for the three months ended June 30, 2018 and 2017, respectively.

[5] Includes intersegment sales of $3 million and $2 million for the six months ended June 30, 2018 and 2017, respectively.

[6] Includes intersegment sales of $130 million and $109 million for the three months ended June 30, 2018 and 2017, respectively.

[7] Includes intersegment sales of $255 million and $206 million for the six months ended June 30, 2018 and 2017, respectively.