Consolidating Guarantor Financial Information (Schedule of Consolidating Statements of Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	$ 620	$ 1,101	$ 372
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	1	1	0
Foreign currency translation	(148)	20	5
Gain (loss) on cash flow hedges	40	6	7
Pension and postretirement benefits	(54)	58	(11)
Total other comprehensive income (loss), net of tax	(161)	85	1
Total comprehensive income (loss), net of tax	459	1,186	373
Comprehensive (income) loss attributable to noncontrolling interests	4	0	0
Comprehensive income (loss) attributable to Celanese Corporation	463	1,186	373
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	624	1,101	372
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	1	1	0
Foreign currency translation	(148)	20	5
Gain (loss) on cash flow hedges	40	6	7
Pension and postretirement benefits	(54)	58	(11)
Total other comprehensive income (loss), net of tax	(161)	85	1
Total comprehensive income (loss), net of tax	463	1,186	373
Comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Comprehensive income (loss) attributable to Celanese Corporation	463	1,186	373
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	622	1,096	369
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	1	1	0
Foreign currency translation	(148)	20	5
Gain (loss) on cash flow hedges	40	6	7
Pension and postretirement benefits	(54)	58	(11)
Total other comprehensive income (loss), net of tax	(161)	85	1
Total comprehensive income (loss), net of tax	461	1,181	370
Comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Comprehensive income (loss) attributable to Celanese Corporation	461	1,181	370
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	590	731	463
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	1	1	0
Foreign currency translation	(31)	(10)	(12)
Gain (loss) on cash flow hedges	(1)	0	(1)
Pension and postretirement benefits	(54)	56	(2)
Total other comprehensive income (loss), net of tax	(85)	47	(15)
Total comprehensive income (loss), net of tax	505	778	448
Comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Comprehensive income (loss) attributable to Celanese Corporation	505	778	448
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	290	546	173
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	1	0	0
Foreign currency translation	(65)	(8)	1
Gain (loss) on cash flow hedges	(7)	0	3
Pension and postretirement benefits	(5)	2	(11)
Total other comprehensive income (loss), net of tax	(76)	(6)	(7)
Total comprehensive income (loss), net of tax	214	540	166
Comprehensive (income) loss attributable to noncontrolling interests	4	0	0
Comprehensive income (loss) attributable to Celanese Corporation	218	540	166
Consolidation Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	(1,506)	(2,373)	(1,005)
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	(3)	(2)	0
Foreign currency translation	244	(2)	6
Gain (loss) on cash flow hedges	(32)	(6)	(9)
Pension and postretirement benefits	113	(116)	24
Total other comprehensive income (loss), net of tax	322	(126)	21
Total comprehensive income (loss), net of tax	(1,184)	(2,499)	(984)
Comprehensive (income) loss attributable to noncontrolling interests	0	0	0
Comprehensive income (loss) attributable to Celanese Corporation	$ (1,184)	$ (2,499)	$ (984)