Consolidating Guarantor Financial Information (Schedule of Consolidating Statements of Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	$ 258	$ 133	$ 453	$ 275
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	0	0	0	0
Foreign currency translation	(22)	26	(17)	(5)
Gain (loss) from cash flow hedges	(3)	2	(6)	3
Pension and postretirement benefits	(14)	0	(26)	0
Total other comprehensive income (loss), net of tax	(39)	28	(49)	(2)
Total comprehensive income (loss), net of tax	219	161	404	273
Comprehensive (income) loss attributable to noncontrolling interests	1	0	2	0
Comprehensive income (loss) attributable to Celanese Corporation	220	161	406	273
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	259	133	455	275
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	0	0	0	0
Foreign currency translation	(22)	26	(17)	(5)
Gain (loss) from cash flow hedges	(3)	2	(6)	3
Pension and postretirement benefits	(14)	0	(26)	0
Total other comprehensive income (loss), net of tax	(39)	28	(49)	(2)
Total comprehensive income (loss), net of tax	220	161	406	273
Comprehensive (income) loss attributable to noncontrolling interests	0	0	0	0
Comprehensive income (loss) attributable to Celanese Corporation	220	161	406	273
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	259	130	454	271
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	0	0	0	0
Foreign currency translation	(22)	26	(17)	(5)
Gain (loss) from cash flow hedges	(3)	2	(6)	3
Pension and postretirement benefits	(14)	0	(26)	0
Total other comprehensive income (loss), net of tax	(39)	28	(49)	(2)
Total comprehensive income (loss), net of tax	220	158	405	269
Comprehensive (income) loss attributable to noncontrolling interests	0	0	0	0
Comprehensive income (loss) attributable to Celanese Corporation	220	158	405	269
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	152	169	345	335
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	0	0	0	0
Foreign currency translation	(9)	(2)	7	3
Gain (loss) from cash flow hedges	0	(1)	0	(1)
Pension and postretirement benefits	(14)	0	(26)	0
Total other comprehensive income (loss), net of tax	(23)	(3)	(19)	2
Total comprehensive income (loss), net of tax	129	166	326	337
Comprehensive (income) loss attributable to noncontrolling interests	0	0	0	0
Comprehensive income (loss) attributable to Celanese Corporation	129	166	326	337
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	148	36	222	62
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	0	0	0	0
Foreign currency translation	2	(3)	(14)	2
Gain (loss) from cash flow hedges	(3)	0	(3)	0
Pension and postretirement benefits	0	0	0	0
Total other comprehensive income (loss), net of tax	(1)	(3)	(17)	2
Total comprehensive income (loss), net of tax	147	33	205	64
Comprehensive (income) loss attributable to noncontrolling interests	1	0	2	0
Comprehensive income (loss) attributable to Celanese Corporation	148	33	207	64
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net earnings (loss)	(560)	(335)	(1,023)	(668)
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	0	0	0	0
Foreign currency translation	29	(21)	24	0
Gain (loss) from cash flow hedges	6	(1)	9	(2)
Pension and postretirement benefits	28	0	52	0
Total other comprehensive income (loss), net of tax	63	(22)	85	(2)
Total comprehensive income (loss), net of tax	(497)	(357)	(938)	(670)
Comprehensive (income) loss attributable to noncontrolling interests	0	0	0	0
Comprehensive income (loss) attributable to Celanese Corporation	$ (497)	$ (357)	$ (938)	$ (670)