Unaudited Interim Consolidated Statement Equity - 6 months ended Jun. 30, 2016 - USD ($) $ in Millions	Total	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, shares at Dec. 31, 2015		146,782,297	19,916,490
Balance as of the beginning of the period at Dec. 31, 2015	$ 2,829
Total Celanese Corporation stockholders' equity at Dec. 31, 2015	2,378	$ 0	$ (1,031)	$ 136	$ 3,621	$ (348)
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2015	$ 451						$ 451
Stock option exercises, shares		93,520
Stock option exercises, net of tax		$ 0		3
Purchases of treasury stock, shares		(2,821,140)
Purchases of treasury stock, including related fees		$ 0
Stock awards, shares		681,994
Stock awards		$ 0
Purchases of treasury stock, shares	2,821,140		2,821,140
Purchases of treasury stock, including related fees	$ (200)		$ (200)
Stock-based compensation, net of tax				(6)
Net earnings (loss) attributable to Celanese Corporation	478				478
Series A common stock dividends					(98)
Other comprehensive income (loss), net of tax	47					47
Net earnings (loss) attributable to noncontrolling interests	4						4
Balance as of the end of the period, shares at Jun. 30, 2016		144,736,671	22,737,630
Stockholders' Equity Attributable to Noncontrolling Interest at Jun. 30, 2016	449						449
(Distributions to) contributions from noncontrolling interests							$ (6)
Total Celanese Corporation stockholders' equity at Jun. 30, 2016	2,602	$ 0	$ (1,231)	$ 133	$ 4,001	$ (301)
Balance as of the end of the period at Jun. 30, 2016	$ 3,051