Unaudited Interim Consolidated Statement of Operations - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Net sales	$ 2,389	$ 2,611
Cost of sales	(1,913)	(2,057)
Gross profit	476	554
Selling, general and administrative expenses	(230)	(265)
Amortization of intangible assets	(40)	(41)
Research and development expenses	(31)	(34)
Other (charges) gains, net	(31)	(14)
Foreign exchange gain (loss), net	21	11
Gain (loss) on disposition of businesses and assets, net	3	(1)
Operating profit (loss)	168	210
Equity in net earnings (loss) of affiliates	22	55
Non-operating pension and other postretirement employee benefit (expense) income	2	2
Interest expense	(170)	(169)
Refinancing expense	32	0
Interest income	4	13
Dividend income - equity investments	1	34
Other income (expense), net	2	12
Earnings (loss) from continuing operations before tax	(3)	157
Income tax (provision) benefit	(9)	(33)
Earnings (loss) from continuing operations	(12)	124
Earnings (loss) from operation of discontinued operations	(6)	0
Income tax (provision) benefit from discontinued operations	1	0
Earnings (loss) from discontinued operations	(5)	0
Net earnings (loss)	(17)	124
Net (earnings) loss attributable to noncontrolling interests	(4)	(3)
Net earnings (loss) attributable to Celanese Corporation	(21)	121
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations	(16)	121
Earnings (loss) from discontinued operations	(5)	0
Net earnings (loss)	$ (21)	$ 121
Earnings (loss) per common share - basic
Continuing operations - basic (in dollars per share)	$ (0.15)	$ 1.11
Discontinued operations - basic (in dollars per share)	(0.04)	0
Net earnings (loss) - basic (in dollars per share)	(0.19)	1.11
Earnings (loss) per common share - diluted
Continuing operations - diluted (in dollars per share)	(0.15)	1.10
Discontinued operations - diluted (in dollars per share)	(0.04)	0
Net earnings (loss) - diluted (in dollars per share)	$ (0.19)	$ 1.10
Weighted average shares - basic (in shares)	109,421,035	109,069,060
Weighted average shares - diluted (in shares)	109,421,035	109,513,991