Revenue Recognition Disaggregated Revenue (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Net sales		$ 10,280	$ 10,940	$ 9,673
Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales		(90)	(93)	(94)
Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		5,607	6,149	4,024
Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales	[1]	4,673	4,791	5,649
Acetyl Chain | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales		90	93	94
North America [Member] | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		1,553	1,780	1,197
North America [Member] | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		1,526	1,448	1,713
Europe and Africa | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		1,641	1,941	1,538
Europe and Africa | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		1,613	1,680	1,961
Asia Pacific [Member] | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		2,272	2,274	1,180
Asia Pacific [Member] | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		1,415	1,543	1,811
South America [Member] | Engineered Materials
Disaggregation of Revenue [Line Items]
Net sales		141	154	109
South America [Member] | Acetyl Chain
Disaggregation of Revenue [Line Items]
Net sales		$ 119	$ 120	$ 164

[1] Excludes intersegment sales of $90 million, $93 million and $94 million for the years ended December 31, 2024, 2023 and 2022, respectively.