Revenue Recognition - Disaggregation of net sales (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2022		Jun. 30, 2021		Jun. 30, 2022		Jun. 30, 2021
Revenue, Major Customer [Line Items]
Net sales		$ 2,486		$ 2,198		$ 5,024		$ 3,996
Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales	[1]	1,419		1,378		2,922		2,412
Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		948		682		1,858		1,327
Acetate Tow
Revenue, Major Customer [Line Items]
Net sales		119		138		244		257
Intersegment Eliminations [Member]
Revenue, Major Customer [Line Items]
Net sales		(37)	[2]	(31)	[2]	(72)	[3]	(53)	[3]
Intersegment Eliminations [Member] | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		37		31		72		53
North America [Member] | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		425		360		825		641
North America [Member] | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		284		188		573		352
North America [Member] | Acetate Tow
Revenue, Major Customer [Line Items]
Net sales		26		25		51		53
Europe and Africa [Member] | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		488		420		1,021		730
Europe and Africa [Member] | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		380		304		757		600
Europe and Africa [Member] | Acetate Tow
Revenue, Major Customer [Line Items]
Net sales		57		72		116		140
Asia Pacific [Member] | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		476		567		997		990
Asia Pacific [Member] | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		256		169		477		333
Asia Pacific [Member] | Acetate Tow
Revenue, Major Customer [Line Items]
Net sales		34		38		74		60
South America [Member] | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		30		31		79		51
South America [Member] | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		28		21		51		42
South America [Member] | Acetate Tow
Revenue, Major Customer [Line Items]
Net sales		$ 2		$ 3		$ 3		$ 4

[1] Excludes intersegment sales of $37 million and $31 million for the three months ended June 30, 2022 and 2021, respectively. Excludes intersegment sales of $72 million and $53 million for the six months ended June 30, 2022 and 2021, respectively.

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

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