Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations	$ 258	$ 171	$ 713	$ 445
Earnings (loss) from discontinued operations	(5)	1	(5)	2
Net earnings (loss)	$ 253	$ 172	$ 708	$ 447
Weighted average shares - basic	154,427,554	158,501,075	155,552,777	159,282,314
Dilutive stock options	125,259	230,110	150,099	229,920
Dilutive restricted stock units	621,715	364,346	622,635	334,359
Weighted average shares - diluted	155,174,528	159,095,531	156,325,511	159,846,593