Unaudited Interim Consolidated Statement of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net sales	$ 2,648	$ 2,723	$ 7,910	$ 8,371
Cost of sales	(2,026)	(2,050)	(6,093)	(6,381)
Gross profit	622	673	1,817	1,990
Selling, general and administrative expenses	(248)	(244)	(768)	(803)
Amortization of intangible assets	(40)	(41)	(119)	(124)
Research and development expenses	(32)	(32)	(99)	(114)
Other (charges) gains, net	(61)	(17)	(123)	(50)
Foreign exchange gain (loss), net	10	0	12	21
Gain (loss) on disposition of businesses and assets, net	(3)	503	(12)	508
Operating profit (loss)	248	842	708	1,428
Equity in net earnings (loss) of affiliates	51	12	157	50
Non-operating pension and other postretirement employee benefit (expense) income	3	(1)	7	(2)
Interest expense	(169)	(178)	(512)	(542)
Refinancing expense	0	7	0	7
Interest income	5	12	28	27
Dividend income - equity investments	30	30	95	95
Other income (expense), net	15	4	40	2
Earnings (loss) from continuing operations before tax	183	714	523	1,051
Income tax (provision) benefit	(61)	236	(123)	215
Earnings (loss) from continuing operations	122	950	400	1,266
Earnings (loss) from operation of discontinued operations	(3)	(1)	(4)	(4)
Income tax (provision) benefit from discontinued operations	1	0	1	1
Earnings (loss) from discontinued operations	(2)	(1)	(3)	(3)
Net earnings (loss)	120	949	397	1,263
Net (earnings) loss attributable to noncontrolling interests	(4)	2	(5)	(1)
Net earnings (loss) attributable to Celanese Corporation	116	951	392	1,262
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations	118	952	395	1,265
Earnings (loss) from discontinued operations	(2)	(1)	(3)	(3)
Net earnings (loss)	$ 116	$ 951	$ 392	$ 1,262
Earnings (loss) per common share - basic
Continuing operations - basic (in dollars per share)	$ 1.08	$ 8.74	$ 3.62	$ 11.63
Discontinued operations - basic (in dollars per share)	(0.02)	(0.01)	(0.03)	(0.03)
Net earnings (loss) - basic (in dollars per share)	1.06	8.73	3.59	11.60
Earnings (loss) per common share - diluted
Continuing operations - diluted (in dollars per share)	1.08	8.70	3.61	11.57
Discontinued operations - diluted (in dollars per share)	(0.02)	(0.01)	(0.03)	(0.03)
Net earnings (loss) - diluted (in dollars per share)	$ 1.06	$ 8.69	$ 3.58	$ 11.54
Weighted average shares - basic (in shares)	109,338,977	108,918,986	109,241,174	108,814,288
Weighted average shares - diluted (in shares)	109,535,037	109,439,486	109,517,299	109,338,040