Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations		$ 502	$ 323
Earnings (loss) from discontinued operations		0	(1)
Net earnings (loss)		$ 502	$ 322
Weighted average shares - basic		108,185,912	113,511,369
Incremental shares attributable to equity awards(1)	[1]	731,665	516,776
Weighted average shares - diluted		108,917,577	114,028,145

[1] Excludes 61,297 and 29 equity award shares for the three months ended March 31, 2022 and 2021, respectively, as their effect would have been antidilutive.