Revenue Recognition - Disaggregation of net sales (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022
Revenue, Major Customer [Line Items]
Net sales		$ 2,723		$ 2,301		$ 8,371		$ 7,325
Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		1,528		929		4,743		2,787
Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales	[1]	1,195		1,372		3,628		4,538
Intersegment Eliminations
Revenue, Major Customer [Line Items]
Net sales		(25)	[2]	(25)	[2]	(75)	[3]	(70)	[3]
Intersegment Eliminations | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		25		25		75		70
North America | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		449		292		1,399		865
North America | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		366		461		1,092		1,337
Europe and Africa | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		462		355		1,541		1,112
Europe and Africa | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		395		461		1,292		1,598
Asia-Pacific | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		580		256		1,682		733
Asia-Pacific | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		406		401		1,152		1,472
South America | Engineered Materials
Revenue, Major Customer [Line Items]
Net sales		37		26		121		77
South America | Acetyl Chain
Revenue, Major Customer [Line Items]
Net sales		$ 28		$ 49		$ 92		$ 131

[1] Excludes intersegment sales of $25 million and $25 million for the three months ended September 30, 2023 and 2022, respectively. Excludes intersegment sales of $75 million and $70 million for the nine months ended September 30, 2023 and 2022, respectively.

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

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