Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations		$ 306	$ 631	$ 1,101
Earnings (loss) from discontinued operations		(2)	(7)	0
Net earnings (loss)		$ 304	$ 624	$ 1,101
Weighted average shares - basic		150,838,050	155,012,370	158,801,150
Incremental shares attributable to equity awards	[1]	1,449,905	1,154,623	533,069
Weighted average shares - diluted		152,287,955	156,166,993	159,334,219
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		2,903	0	40,306

[1] Excludes 2,903, 0 and 40,306 equity award shares for the years ended December 31, 2015, 2014 and 2013, respectively, as their effect would have been antidilutive.