Summary of Accounting Policies (Schedule of Change in Accounting Policy For Pension and Other Postretirement Benefits - Consolidated Statements of Equity) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of the beginning of the period	$ 1,730	$ 1,341
Net earnings (loss) attributable to Celanese Corporation	1,101	372	427
Other comprehensive income (loss), net of tax	85	1	0
Balance as of the end of the period	2,699	1,730	1,341
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of the beginning of the period	1,993	1,664	1,271
Net earnings (loss) attributable to Celanese Corporation	1,101	372	427
Balance as of the end of the period	3,011	1,993	1,664
Accumulated Other Comprehensive Income (Loss), Net [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of the beginning of the period	(89)	(90)	(90)
Other comprehensive income (loss), net of tax	85	1	0
Balance as of the end of the period	(4)	(89)	(90)
Previous Accounting Method [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings (loss) attributable to Celanese Corporation	912	605	607
Other comprehensive income (loss), net of tax	274	(232)	(180)
Previous Accounting Method [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of the beginning of the period	2,986	2,424	1,851
Net earnings (loss) attributable to Celanese Corporation	912	605	607
Balance as of the end of the period	3,815	2,986	2,424
Previous Accounting Method [Member] | Accumulated Other Comprehensive Income (Loss), Net [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of the beginning of the period	(1,082)	(850)	(670)
Other comprehensive income (loss), net of tax	274	(232)	(180)
Balance as of the end of the period	(808)	(1,082)	(850)
Effect of Change [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings (loss) attributable to Celanese Corporation	189	(233)	(180)
Other comprehensive income (loss), net of tax	(189)	233	180
Effect of Change [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of the beginning of the period	(993)	(760)	(580)
Net earnings (loss) attributable to Celanese Corporation	189	(233)	(180)
Balance as of the end of the period	(804)	(993)	(760)
Effect of Change [Member] | Accumulated Other Comprehensive Income (Loss), Net [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of the beginning of the period	993	760	580
Other comprehensive income (loss), net of tax	(189)	233	180
Balance as of the end of the period	$ 804	$ 993	$ 760