Segment Information (Schedule of Business Segments) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales		$ 6,297	$ 7,155	$ 6,140
Other (charges) gains, net		(203)	9	(59)
Operating profit (loss)		834	1,334	857
Equity in net earnings (loss) of affiliates		182	233	183
Depreciation and amortization		352	343	305
Capital expenditures	[1]	390	333	281
Goodwill and intangible assets, net		1,386	1,367
Total assets		9,476	9,313
Increase (decrease) in accrued capital expenditures		20	(4)	14
Acetate Tow [Member]
Segment Reporting Information [Line Items]
Net sales		636	649
Acetyl Chain [Member]
Segment Reporting Information [Line Items]
Net sales	[2]	3,275	3,913
Engineered Materials [Member]
Segment Reporting Information [Line Items]
Net sales		2,386	2,593
Operating Segments [Member] | Acetate Tow [Member]
Segment Reporting Information [Line Items]
Net sales	[3]	636	649	668
Other (charges) gains, net		(88)	(2)	(2)
Operating profit (loss)		52	130	189
Equity in net earnings (loss) of affiliates		0	0	0
Depreciation and amortization		45	58	41
Capital expenditures		43	29	39
Goodwill and intangible assets, net		153	153
Total assets		977	1,032
Operating Segments [Member] | Acetyl Chain [Member]
Segment Reporting Information [Line Items]
Net sales	[4]	3,392	4,042	3,371
Other (charges) gains, net		(3)	11	(52)
Operating profit (loss)		678	1,024	509
Equity in net earnings (loss) of affiliates		4	6	6
Depreciation and amortization		161	148	143
Capital expenditures		208	182	150
Goodwill and intangible assets, net		234	240
Total assets		3,489	3,471
Operating Segments [Member] | Engineered Materials [Member]
Segment Reporting Information [Line Items]
Net sales		2,386	2,593	2,213
Other (charges) gains, net		5	0	(2)
Operating profit (loss)		446	460	412
Equity in net earnings (loss) of affiliates		168	218	171
Depreciation and amortization		131	126	111
Capital expenditures		104	105	78
Goodwill and intangible assets, net		999	974
Total assets		4,125	4,012
Corporate, Non-Segment [Member] | Other Activities [Member]
Segment Reporting Information [Line Items]
Net sales		0	0	0
Other (charges) gains, net		(117)	0	(3)
Operating profit (loss)		(342)	(280)	(253)
Equity in net earnings (loss) of affiliates		10	9	6
Depreciation and amortization		15	11	10
Capital expenditures		35	17	14
Goodwill and intangible assets, net		0	0
Total assets		885	798
Intersegment [Member]
Segment Reporting Information [Line Items]
Net sales		(117)	(129)	(112)
Other (charges) gains, net		0	0	0
Operating profit (loss)		0	0	0
Equity in net earnings (loss) of affiliates		0	0	0
Depreciation and amortization		0	0	0
Capital expenditures		0	0	0
Goodwill and intangible assets, net		0	0
Total assets		0	0
Intersegment [Member] | Acetate Tow [Member]
Segment Reporting Information [Line Items]
Net sales		0	0	2
Intersegment [Member] | Acetyl Chain [Member]
Segment Reporting Information [Line Items]
Net sales		$ 117	$ 129	$ 110

[1] Includes an increase in accrued capital expenditures of $20 million, a decrease in accrued capital expenditures of $4 million and an increase in accrued capital expenditures of $14 million for the years ended December 31, 2019, 2018 and 2017, respectively.

[2] Excludes intersegment sales of $117 million and $129 million for the years ended December 31, 2019 and 2018, respectively.

[3] Includes intersegment sales of $0 million, $0 million, $2 million for the years ended December 31, 2019, 2018 and 2017, respectively.

[4] Includes intersegment sales of $117 million, $129 million and $110 million for the years ended December 31, 2019, 2018 and 2017, respectively.