Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations		$ (1,514)	$ 1,969	$ 1,902
Earnings (loss) from discontinued operations		(8)	(9)	(8)
Net earnings (loss) attributable to Celanese Corporation		$ (1,522)	$ 1,960	$ 1,894
Weighted average shares - basic (in shares)		109,273,779	108,848,962	108,380,082
Incremental shares attributable to equity awards	[1]	0	530,702	855,294
Weighted average shares - diluted		109,273,779	109,379,664	109,235,376
Antidilutive securities excluded from computation of earnings per share, amount (in shares)		239,886
Share-based Payment Arrangement, Option [Member]
Amounts attributable to Celanese Corporation
Antidilutive securities excluded from computation of earnings per share, amount (in shares)		265,922	202,876	0
Time Restricted Stock Units (RSUs) [Member]
Amounts attributable to Celanese Corporation
Antidilutive securities excluded from computation of earnings per share, amount (in shares)		61	39,465	154,172

[1] Excludes options to purchase 265,922, 202,876 and 0 shares of Common Stock for the years ended December 31, 2024, 2023 and 2022, respectively, as their effect would have been antidilutive. Excludes 61, 39,465 and 154,172 equity award shares for the years ended December 31, 2024, 2023 and 2022, respectively, as their effect would have been antidilutive. For the year ended December 31, 2024, the Company incurred a net loss from continuing operations, resulting in 239,886 incremental shares attributable to equity awards being excluded from the number of weighted average shares - diluted as their effect would have been antidilutive.