Segment Information - Schedule of Business Segments (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2024		Sep. 30, 2023		Sep. 30, 2024		Sep. 30, 2023		Dec. 31, 2023
Segment Reporting Information [Line Items]
Net sales		$ 2,648		$ 2,723		$ 7,910		$ 8,371
Other (charges) gains, net (Note 14)		(61)		(17)		(123)		(50)
Operating profit (loss)		248		842		708		1,428
Equity in net earnings (loss) of affiliates		51		12		157		50
Depreciation and amortization		203		173		616		517
Capital expenditures		99	[1]	119	[1]	291	[2]	379	[2]
Goodwill and intangible assets, net		10,855				10,855				$ 10,952
Total assets		25,892				25,892				26,597
Increase (decrease) in accrued capital expenditures		11		(12)		(39)		(61)
Engineered Materials
Segment Reporting Information [Line Items]
Net sales		1,481		1,528		4,326		4,743
Acetyl Chain
Segment Reporting Information [Line Items]
Net sales	[3]	1,167		1,195		3,584		3,628
Operating Segments | Engineered Materials
Segment Reporting Information [Line Items]
Net sales		1,481		1,528		4,326		4,743
Other (charges) gains, net (Note 14)		(60)		(15)		(114)		(44)
Operating profit (loss)		102		691	[4]	329		961	[5]
Equity in net earnings (loss) of affiliates		44		8		140		37
Depreciation and amortization		127		111		395		335
Capital expenditures		59		51		137		154
Goodwill and intangible assets, net		10,426				10,426				10,525
Total assets		17,631				17,631				17,930
Operating Segments | Acetyl Chain
Segment Reporting Information [Line Items]
Net sales		1,190		1,220		3,653		3,703
Other (charges) gains, net (Note 14)		1		0		0		(1)
Operating profit (loss)		239		272		735		845
Equity in net earnings (loss) of affiliates		2		1		7		4
Depreciation and amortization		63		55		181		163
Capital expenditures		33		44		109		162
Goodwill and intangible assets, net		429				429				427
Total assets		5,544				5,544				5,538
Segment Reporting, Reconciling Item, Corporate Nonsegment | Other Activities
Segment Reporting Information [Line Items]
Net sales		0		0		0		0
Other (charges) gains, net (Note 14)		(2)		(2)		(9)		(5)
Operating profit (loss)		(93)		(121)		(356)		(378)
Equity in net earnings (loss) of affiliates		5		3		10		9
Depreciation and amortization		13		7		40		19
Capital expenditures		7		24		45		63
Goodwill and intangible assets, net		0				0				0
Total assets		2,717				2,717				3,129
Eliminations
Segment Reporting Information [Line Items]
Net sales		(23)	[6]	(25)	[6]	(69)	[7]	(75)	[7]
Other (charges) gains, net (Note 14)		0		0		0		0
Operating profit (loss)		0		0		0		0
Equity in net earnings (loss) of affiliates		0		0		0		0
Depreciation and amortization		0		0		0		0
Capital expenditures		0		0		0		0
Goodwill and intangible assets, net		0				0				0
Total assets		0				0				$ 0
Eliminations | Acetyl Chain
Segment Reporting Information [Line Items]
Net sales		$ 23		$ 25		$ 69		$ 75

[1] Includes an increase in accrued capital expenditures of $11 million and a decrease of $12 million for the three months ended September 30, 2024 and 2023, respectively.

[2] Includes a decrease in accrued capital expenditures of $39 million and $61 million for the nine months ended September 30, 2024 and 2023, respectively.

[3] Excludes intersegment sales of $23 million and $25 million for the three months ended September 30, 2024 and 2023, respectively. Excludes intersegment sales of $69 million and $75 million for the nine months ended September 30, 2024 and 2023, respectively.

[4] Includes a gain related to the formation of the Nutrinova joint venture included in Gain (loss) on disposition of businesses and assets, net in the unaudited interim consolidated statements of operations (Note 3).

[5] Includes a gain related to the formation of the Nutrinova joint venture included in Gain (loss) on disposition of businesses and assets, net in the unaudited interim consolidated statements of operations (Note 3).

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

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