Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations	$ 259	$ 133	$ 455	$ 274
Earnings (loss) from discontinued operations	0	0	0	1
Net earnings (loss)	$ 259	$ 133	$ 455	$ 275
Weighted average shares - basic	155,751,779	159,676,462	156,124,714	159,679,408
Dilutive stock options	156,658	213,834	161,114	216,890
Dilutive restricted stock units	145,795	251,860	138,837	242,661
Weighted average shares - diluted	156,054,232	160,142,156	156,424,665	160,138,959