Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations		$ 1,912	$ 1,997	$ 858
Earnings (loss) from discontinued operations		(22)	(12)	(6)
Net earnings (loss) attributable to Celanese Corporation		$ 1,890	$ 1,985	$ 852
Weighted average shares - basic		111,224,017	117,817,445	123,925,697
Incremental shares attributable to equity awards	[1]	860,395	663,931	726,062
Weighted average shares - diluted		112,084,412	118,481,376	124,651,759
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		555	4,313	45

[1] Excludes 555, 4,313 and 45 equity award shares for the years ended December 31, 2021, 2020 and 2019, respectively, as their effect would have been antidilutive.