Goodwill and Intangible Assets, Net - Schedule of Goodwill (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
		Sep. 30, 2025	Sep. 30, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
As of December 31, 2024	[1]		$ 5,387
Impairment losses		$ (1,100)	(1,140)
Transfer(2)	[2]		(154)
Exchange rate changes			77
As of September 30, 2025(1)	[1]	4,170	4,170
Goodwill, Impaired, Accumulated Impairment Loss		(2,700)	(2,700)	$ (1,500)
Engineered Materials
Goodwill [Roll Forward]
As of December 31, 2024	[1]		5,025
Impairment losses		(1,000)	(1,140)
Transfer(2)	[2]		(154)
Exchange rate changes			50
As of September 30, 2025(1)	[1]	3,781	3,781
Acetyl Chain
Goodwill [Roll Forward]
As of December 31, 2024	[1]		362
Impairment losses			0
Transfer(2)	[2]		0
Exchange rate changes			27
As of September 30, 2025(1)	[1]	$ 389	$ 389

[1] Includes accumulated impairment losses of approximately $2.7 billion in the Engineered Materials segment as of September 30, 2025 and $1.5 billion as of December 31, 2024.

[2] Related to goodwill reclassified to assets held for sale (Note 3).