Revenue Recognition - Disaggregation of net sales (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2024		Jun. 30, 2023		Jun. 30, 2024		Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Net sales		$ 2,651		$ 2,795		$ 5,262		$ 5,648
Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		1,467		1,585		2,845		3,215
Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales	[1]	1,184		1,210		2,417		2,433
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Net sales		(18)	[2]	(23)	[2]	(46)	[3]	(50)	[3]
Intersegment Eliminations | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		18		23		46		50
North America | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		420		471		792		950
North America | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		390		361		778		726
Europe and Africa | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		443		519		899		1,079
Europe and Africa | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		421		437		844		897
Asia-Pacific | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		567		554		1,083		1,102
Asia-Pacific | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		346		379		740		746
South America | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		37		41		71		84
South America | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		$ 27		$ 33		$ 55		$ 64

[1] Excludes intersegment sales of $18 million and $23 million for the three months ended June 30, 2024 and 2023, respectively. Excludes intersegment sales of $46 million and $50 million for the six months ended June 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.