Segment Information (Schedule of Business Segments) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net sales		$ 1,798	$ 1,460
Other (charges) gains, net (Note 14)		6	(6)
Operating profit (loss)		326	194
Equity in net earnings (loss) of affiliates		29	57
Depreciation and amortization		90	85
Capital expenditures	[1]	73	86
Goodwill and intangible assets, net		1,442		$ 1,485
Total assets		10,756		10,909
Increase (decrease) in accrued capital expenditures		(19)	(33)
Acetate Tow
Segment Reporting Information [Line Items]
Net sales		119	129
Acetyl Chain
Segment Reporting Information [Line Items]
Net sales	[2]	1,034	768
Engineered Materials
Segment Reporting Information [Line Items]
Net sales		645	563
Operating Segments [Member] | Acetate Tow
Segment Reporting Information [Line Items]
Net sales		119	129
Other (charges) gains, net (Note 14)		0	(1)
Operating profit (loss)		16	27
Equity in net earnings (loss) of affiliates		0	0
Depreciation and amortization		10	8
Capital expenditures		11	10
Goodwill and intangible assets, net		154		154
Total assets		991		975
Operating Segments [Member] | Acetyl Chain
Segment Reporting Information [Line Items]
Net sales		1,056	799
Other (charges) gains, net (Note 14)		0	0
Operating profit (loss)		251	135
Equity in net earnings (loss) of affiliates		2	1
Depreciation and amortization		41	39
Capital expenditures		33	43
Goodwill and intangible assets, net		289		301
Total assets		4,097		3,930
Operating Segments [Member] | Engineered Materials
Segment Reporting Information [Line Items]
Net sales		645	563
Other (charges) gains, net (Note 14)		7	0
Operating profit (loss)		130	102
Equity in net earnings (loss) of affiliates		25	53
Depreciation and amortization		35	34
Capital expenditures		23	24
Goodwill and intangible assets, net		999		1,030
Total assets		3,987		3,990
Corporate, Non-Segment [Member] | Other
Segment Reporting Information [Line Items]
Net sales		0	0
Other (charges) gains, net (Note 14)		(1)	(5)
Operating profit (loss)		(71)	(70)
Equity in net earnings (loss) of affiliates		2	3
Depreciation and amortization		4	4
Capital expenditures		6	9
Goodwill and intangible assets, net		0		0
Total assets		1,681		2,014
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	[3]	(22)	(31)
Other (charges) gains, net (Note 14)		0	0
Operating profit (loss)		0	0
Equity in net earnings (loss) of affiliates		0	0
Depreciation and amortization		0	0
Capital expenditures		0	0
Goodwill and intangible assets, net		0		0
Total assets		0		$ 0
Eliminations [Member] | Acetyl Chain
Segment Reporting Information [Line Items]
Net sales		$ 22	$ 31

[1] Includes a decrease in accrued capital expenditures of $19 million and $33 million for the three months ended March 31, 2021 and 2020, respectively.

[2] Excludes intersegment sales of $22 million and $31 million for the three months ended March 31, 2021 and 2020, respectively.

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