Acquisitions, Dispositions and Plant Closures Plant Closures - Schedule of Exit and Shutdown Cost Related to Closure (Details) - Lanaken Belgium - Acetyl Chain $ in Millions	9 Months Ended
	Sep. 30, 2026 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring (Note 18)	$ 41
Accelerated depreciation expense(2)	53	[1]
Total	94
Restructuring and Related Cost, Expected Cost Remaining	$ 15

[1] Included in Cost of sales in the unaudited interim consolidated statements of operations.