Earnings (Loss) Per Share - Schedule of Earnings (Loss) Per Share (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations		$ 121	$ 94
Earnings (loss) from discontinued operations		0	(3)
Net earnings (loss)		$ 121	$ 91
Weighted average shares - basic (in shares)		109,069,060	108,634,068
Incremental shares attributable to equity awards(1)	[1]	444,931	554,198
Weighted average shares - diluted		109,513,991	109,188,266

[1] Excludes stock options to purchase 68,415, and 86,194 shares of Common Stock for the three months ended March 31, 2024 and 2023, respectively; and 0 and 72,574 equity award shares for the three months ended March 31, 2024 and 2023, respectively, as their effect would have been antidilutive.