Unaudited Interim Consolidated Statement of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net sales	$ 2,723	$ 2,301	$ 8,371	$ 7,325
Cost of sales	(2,050)	(1,755)	(6,381)	(5,329)
Gross profit	673	546	1,990	1,996
Selling, general and administrative expenses	(244)	(184)	(803)	(555)
Amortization of intangible assets	(41)	(10)	(124)	(32)
Research and development expenses	(32)	(25)	(114)	(75)
Other (charges) gains, net	(17)	(15)	(50)	(15)
Foreign exchange gain (loss), net	0	(2)	21	(4)
Gain (loss) on disposition of businesses and assets, net	503	(2)	508	7
Operating profit (loss)	842	308	1,428	1,322
Equity in net earnings (loss) of affiliates	12	73	50	189
Non-operating pension and other postretirement employee benefit (expense) income	(1)	25	(2)	74
Interest expense	(178)	(154)	(542)	(237)
Refinancing expense	(7)	0	(7)	0
Interest income	12	34	27	36
Dividend income - equity investments	30	30	95	103
Other income (expense), net	4	5	2	4
Earnings (loss) from continuing operations before tax	714	321	1,051	1,491
Income tax (provision) benefit	236	(127)	215	(351)
Earnings (loss) from continuing operations	950	194	1,266	1,140
Earnings (loss) from operation of discontinued operations	(1)	0	(4)	(8)
Income tax (provision) benefit from discontinued operations	0	(1)	1	1
Earnings (loss) from discontinued operations	(1)	(1)	(3)	(7)
Net earnings (loss)	949	193	1,263	1,133
Net (earnings) loss attributable to noncontrolling interests	2	(2)	(1)	(6)
Net earnings (loss) attributable to Celanese Corporation	951	191	1,262	1,127
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations	952	192	1,265	1,134
Earnings (loss) from discontinued operations	(1)	(1)	(3)	(7)
Net earnings (loss)	$ 951	$ 191	$ 1,262	$ 1,127
Earnings (loss) per common share - basic
Continuing operations - basic (in dollars per share)	$ 8.74	$ 1.77	$ 11.63	$ 10.47
Discontinued operations - basic (in dollars per share)	(0.01)	(0.01)	(0.03)	(0.07)
Net earnings (loss) - basic (in dollars per share)	8.73	1.76	11.60	10.40
Earnings (loss) per common share - diluted
Continuing operations - diluted (in dollars per share)	8.70	1.76	11.57	10.39
Discontinued operations - diluted (in dollars per share)	(0.01)	(0.01)	(0.03)	(0.07)
Net earnings (loss) - diluted (in dollars per share)	$ 8.69	$ 1.75	$ 11.54	$ 10.32
Weighted average shares - basic (in shares)	108,918,986	108,428,982	108,814,288	108,336,574
Weighted average shares - diluted (in shares)	109,439,486	109,065,970	109,338,040	109,158,832