Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations		$ 1,969	$ 1,902	$ 1,912
Earnings (loss) from discontinued operations		(9)	(8)	(22)
Net earnings (loss) attributable to Celanese Corporation		$ 1,960	$ 1,894	$ 1,890
Weighted average shares - basic		108,848,962	108,380,082	111,224,017
Incremental shares attributable to equity awards	[1]	530,702	855,294	860,395
Weighted average shares - diluted		109,379,664	109,235,376	112,084,412
Share-based Payment Arrangement, Option [Member]
Amounts attributable to Celanese Corporation
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		202,876	0	0
Time Restricted Stock Units (RSUs) [Member]
Amounts attributable to Celanese Corporation
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		39,465	154,172	555

[1] Excludes options to purchase 202,876, 0 and 0 shares of Common Stock for the years ended December 31, 2023, 2022 and 2021, respectively, as their effect would have been antidilutive. Excludes 39,465, 154,172 and 555 equity award shares for the years ended December 31, 2023, 2022 and 2021, respectively, as their effect would have been antidilutive.