Consolidated Statement Equity (USD $) In Millions, except Share data	Total	Total Celanese Corporation Stockholders' Equity [Member]	Series A Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balance as of the beginning of the period at Dec. 31, 2014	$ 3,078		$ 0	$ (611)	$ 103	$ 3,491	$ (165)	$ 260
Balance as of the beginning of the period, shares at Dec. 31, 2014			152,902,710	13,266,625
Stock option exercises, shares			7,500
Stock option exercises, net of tax			0		0
Purchases of treasury stock, shares			0
Purchases of treasury stock, including related fees			0
Stock awards, shares			340,311
Stock awards			0
Purchases of treasury stock, shares	0			0
Purchases of treasury stock, including related fees	0			0
Stock-based compensation, net of tax					2
Net earnings (loss) attributable to Celanese Corporation	236					236
Series A common stock dividends						(38)
Other comprehensive income (loss), net of tax	(157)						(157)
Net earnings (loss) attributable to noncontrolling interests	(2)							(2)
Contributions from noncontrolling interests								80
Balance as of the end of the period at Mar. 31, 2015	3,199		0	(611)	105	3,689	(322)	338
Total Celanese Corporation stockholders' equity at Mar. 31, 2015	$ 2,861	$ 2,861
Balance as of the end of the period, shares at Mar. 31, 2015			153,250,521	13,266,625