Segment Information (Schedule of Business Segments) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net sales		$ 9,544	$ 10,268	$ 10,926
Cost of sales		(7,592)	(7,932)	(8,343)
Gross Profit		1,952	2,336	2,583
Selling, General and Administrative Expense		(899)	(1,033)	(1,077)
Amortization of Intangible Assets		(164)	(159)	(164)
Research and Development Expense		(125)	(130)	(146)
Other (charges) gains, net		(1,581)	(1,744)	(68)
Gain (loss) on disposition of businesses and assets, net		(5)	(14)	505
Other segment items(2)	[1]	36	24	32
Operating profit (loss)		(786)	(720)	1,665
Depreciation and amortization		760	801	706
Equity in net earnings (loss) of affiliates		127	196	102
Capital expenditures	[2]	326	414	542
Goodwill and intangible assets, net		7,355	9,028
Total assets		21,695	22,838
Increase (decrease) in accrued capital expenditures		(17)	(21)	(26)
Engineered Materials
Segment Reporting Information [Line Items]
Net sales		5,390	5,595	6,135
Equity in net earnings (loss) of affiliates	[3]	114	182	88
Acetyl Chain
Segment Reporting Information [Line Items]
Net sales	[4]	4,154	4,673	4,791
Other Activities
Segment Reporting Information [Line Items]
Equity in net earnings (loss) of affiliates		13	14	14
Operating Segments [Member] | Engineered Materials
Segment Reporting Information [Line Items]
Net sales		5,390	5,595	6,135
Cost of sales		(4,147)	(4,376)	(4,828)
Gross Profit		1,243	1,219	1,307
Selling, General and Administrative Expense		(401)	(435)	(436)
Amortization of Intangible Assets		(162)	(157)	(162)
Research and Development Expense		(85)	(90)	(97)
Other (charges) gains, net		(1,552)	(1,724)	(56)
Gain (loss) on disposition of businesses and assets, net		(1)	(10)	509
Other segment items(2)	[1]	0	0	0
Operating profit (loss)		(958)	(1,197)	1,065
Depreciation and amortization		447	510	462
Equity in net earnings (loss) of affiliates		105	172	83
Capital expenditures		167	211	237
Goodwill and intangible assets, net		6,917	8,617
Total assets		13,971	15,485
Operating Segments [Member] | Acetyl Chain
Segment Reporting Information [Line Items]
Net sales	[5]	4,232	4,763	4,884
Cost of sales		(3,525)	(3,650)	(3,610)
Gross Profit		707	1,113	1,274
Selling, General and Administrative Expense		(111)	(121)	(119)
Amortization of Intangible Assets		(2)	(2)	(2)
Research and Development Expense		(40)	(40)	(40)
Other (charges) gains, net		(11)	0	(4)
Gain (loss) on disposition of businesses and assets, net		(4)	(4)	(4)
Other segment items(2)	[1]	0	0	0
Operating profit (loss)		539	946	1,105
Depreciation and amortization		263	244	217
Equity in net earnings (loss) of affiliates		10	10	6
Capital expenditures		135	151	207
Goodwill and intangible assets, net		438	411
Total assets		5,302	5,257
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Other Activities
Segment Reporting Information [Line Items]
Net sales		0	0	0
Cost of sales		2	4	2
Gross Profit		2	4	2
Selling, General and Administrative Expense		(387)	(477)	(522)
Amortization of Intangible Assets		0	0	0
Research and Development Expense		0	0	(9)
Other (charges) gains, net		(18)	(20)	(8)
Gain (loss) on disposition of businesses and assets, net		0	0	0
Other segment items(2)	[1]	36	24	32
Operating profit (loss)		(367)	(469)	(505)
Depreciation and amortization		50	47	27
Equity in net earnings (loss) of affiliates		12	14	13
Capital expenditures		24	52	98
Goodwill and intangible assets, net		0	0
Total assets		2,422	2,096
Intersegment [Member]
Segment Reporting Information [Line Items]
Net sales		(78)	(90)	(93)
Cost of sales		78	90	93
Gross Profit		0		0
Selling, General and Administrative Expense		0	0	0
Amortization of Intangible Assets		0	0	0
Research and Development Expense		0	0	0
Other (charges) gains, net		0	0	0
Gain (loss) on disposition of businesses and assets, net		0	0	0
Other segment items(2)	[1]	0	0	0
Operating profit (loss)		0	0	0
Depreciation and amortization		0	0	0
Equity in net earnings (loss) of affiliates		0	0	0
Capital expenditures		0	0	0
Goodwill and intangible assets, net		0	0
Total assets		0	0
Intersegment [Member] | Acetyl Chain
Segment Reporting Information [Line Items]
Net sales		$ 78	$ 90	$ 93

[1] Includes Foreign exchange gain (loss), net.

[2] Includes a decrease in accrued capital expenditures of $17 million, a decrease in accrued capital expenditures of $21 million and a decrease in accrued capital expenditures of $26 million for the years ended December 31, 2025, 2024 and 2023, respectively.

[3] Includes an equity method investment with losses in excess of its carrying amount due to the Company's guarantee of various debt obligations under agreements with third parties related to an equity affiliate (Note 19). This equity method investment is recorded in current Other liabilities (Note 10) in the consolidated balance sheets as of December 31, 2025 and 2024.

[4] Excludes intersegment sales of $78 million, $90 million and $93 million for the years ended December 31, 2025, 2024 and 2023, respectively.

[5] Includes intersegment sales of $78 million, $90 million and $93 million for the years ended December 31, 2025, 2024 and 2023, respectively.