Revenue Recognition - Disaggregation of net sales (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2024		Sep. 30, 2023		Sep. 30, 2024		Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Net sales		$ 2,648		$ 2,723		$ 7,910		$ 8,371
Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		1,481		1,528		4,326		4,743
Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales	[1]	1,167		1,195		3,584		3,628
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Net sales		(23)	[2]	(25)	[2]	(69)	[3]	(75)	[3]
Intersegment Eliminations | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		23		25		69		75
North America | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		419		449		1,211		1,399
North America | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		374		366		1,152		1,092
Europe and Africa | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		414		462		1,313		1,541
Europe and Africa | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		406		395		1,250		1,292
Asia-Pacific | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		610		580		1,693		1,682
Asia-Pacific | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		355		406		1,095		1,152
South America | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		38		37		109		121
South America | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		$ 32		$ 28		$ 87		$ 92

[1] Excludes intersegment sales of $23 million and $25 million for the three months ended September 30, 2024 and 2023, respectively. Excludes intersegment sales of $69 million and $75 million for the nine months ended September 30, 2024 and 2023, respectively.

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

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