Earnings (Loss) Per Share - Schedule of Earnings (Loss) Per Share (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations		$ 94	$ 502
Earnings (loss) from discontinued operations		(3)	0
Net earnings (loss)		$ 91	$ 502
Weighted average shares - basic (in shares)		108,634,068	108,185,912
Incremental shares attributable to equity awards(1)	[1]	554,198	731,665
Weighted average shares - diluted		109,188,266	108,917,577

[1] Excludes options to purchase 86,194 and 0 shares of Common Stock for the three months ended March 31, 2023 and 2022, respectively; and 72,574 and 61,297 shares of Common Stock for the three months ended March 31, 2023 and 2022, respectively, as their effect would have been antidilutive.