Revenue Recognition - Disaggregation of net sales (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Revenue, Major Customer [Line Items]
Net sales		$ 2,538	$ 1,798
Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales	[1]	1,503	1,034
Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		910	645
Acetate Tow
Revenue, Major Customer [Line Items]
Net sales		125	119
Intersegment Eliminations [Member]
Revenue, Major Customer [Line Items]
Net sales	[2]	(35)	(22)
Intersegment Eliminations [Member] | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		35	22
North America [Member] | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		400	281
North America [Member] | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		289	164
North America [Member] | Acetate Tow
Revenue, Major Customer [Line Items]
Net sales		25	28
Europe and Africa [Member] | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		533	310
Europe and Africa [Member] | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		377	296
Europe and Africa [Member] | Acetate Tow
Revenue, Major Customer [Line Items]
Net sales		59	68
Asia Pacific [Member] | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		521	423
Asia Pacific [Member] | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		221	164
Asia Pacific [Member] | Acetate Tow
Revenue, Major Customer [Line Items]
Net sales		40	22
South America [Member] | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		49	20
South America [Member] | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		23	21
South America [Member] | Acetate Tow
Revenue, Major Customer [Line Items]
Net sales		$ 1	$ 1

[1] Excludes intersegment sales of $35 million and $22 million for the three months ended March 31, 2022 and 2021, respectively.

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