Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Amounts attributable to Celanese Corporation
Earnings (loss) from continuing operations	$ 196	$ 141
Earnings (loss) from discontinued operations	0	1
Net earnings (loss)	$ 196	$ 142
Weighted average shares - basic	156,501,794	159,682,386
Dilutive stock options	179,539	240,507
Dilutive restricted stock units	131,582	278,743
Weighted average shares - diluted	156,812,915	160,201,636