Unaudited Interim Consolidated Statement of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Net sales	$ 2,532	$ 2,651	$ 4,921	$ 5,262
Cost of sales	(1,997)	(2,010)	(3,910)	(4,067)
Gross profit	535	641	1,011	1,195
Selling, general and administrative expenses	(213)	(255)	(443)	(520)
Amortization of intangible assets	(42)	(38)	(82)	(79)
Research and development expenses	(31)	(33)	(62)	(67)
Other (charges) gains, net	(20)	(48)	(51)	(62)
Foreign exchange gain (loss), net	6	(9)	27	2
Gain (loss) on disposition of business and assets, net	(2)	(8)	1	(9)
Operating profit (loss)	233	250	401	460
Equity in net earnings (loss) of affiliates	29	51	51	106
Non-operating pension and other postretirement employee benefit (expense) income	1	2	3	4
Interest expense	(177)	(174)	(347)	(343)
Refinancing expense	0	0	32	0
Interest income	7	10	11	23
Dividend income - equity investments	41	31	42	65
Other income (expense), net	1	13	3	25
Earnings (loss) from continuing operations before tax	135	183	132	340
Income tax (provision) benefit	77	(29)	68	(62)
Earnings (loss) from continuing operations	212	154	200	278
Earnings (loss) from operation of discontinued operations	(10)	(1)	(16)	(1)
Income tax (provision) benefit from discontinued operations	0	0	1	0
Earnings (loss) from discontinued operations	(10)	(1)	(15)	(1)
Net earnings (loss)	202	153	185	277
Net (earnings) loss attributable to noncontrolling interests	(3)	2	(7)	(1)
Net earnings (loss) attributable to Celanese Corporation	199	155	178	276
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations	209	156	193	277
Earnings (loss) from discontinued operations	(10)	(1)	(15)	(1)
Net earnings (loss)	$ 199	$ 155	$ 178	$ 276
Earnings (loss) per common share - basic
Continuing operations - basic (in dollars per share)	$ 1.91	$ 1.43	$ 1.76	$ 2.54
Discontinued operations - basic (in dollars per share)	(0.09)	(0.01)	(0.13)	(0.01)
Net earnings (loss) - basic (in dollars per share)	1.82	1.42	1.63	2.53
Earnings (loss) per common share - diluted
Continuing operations - diluted (in dollars per share)	1.90	1.42	1.76	2.53
Discontinued operations - diluted (in dollars per share)	(0.09)	(0.01)	(0.14)	(0.01)
Net earnings (loss) - diluted (in dollars per share)	$ 1.81	$ 1.41	$ 1.62	$ 2.52
Weighted average shares - basic (in shares)	109,526,113	109,314,411	109,473,864	109,191,736
Weighted average shares - diluted (in shares)	109,734,396	109,547,401	109,686,840	109,523,364