Consolidating Guarantor Financial Information (Schedule of Consolidating Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 851	$ 780	$ 998	$ 984
Trade receivables - third party and affiliates	804	801
Non-trade receivables, net	208	241
Inventories, net	744	782
Deferred income taxes	15	29
Marketable securities, at fair value	29	32
Other assets	45	33
Total current assets	2,696	2,698
Investments in affiliates	804	876
Property, plant and equipment	3,685	3,733
Deferred income taxes	275	253
Other assets	343	377
Goodwill	700	749
Intangible assets, net	123	132
Total assets	8,626	8,818
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	128	137
Trade payables - third party and affiliates	664	757
Other liabilities	342	432
Deferred income taxes	6	7
Income taxes payable	55	5
Total current liabilities	1,195	1,338
Noncurrent Liabilities
Long-term debt	2,536	2,608
Deferred income taxes	130	141
Uncertain tax positions	162	159
Benefit obligations	1,144	1,211
Other liabilities	260	283
Total noncurrent liabilities	4,232	4,402
Total Celanese Corporation stockholders' equity	2,861	2,818
Noncontrolling interests	338	260
Total equity	3,199	3,078
Total liabilities and equity	8,626	8,818
Parent Guarantor [Member]
Current Assets
Cash and cash equivalents	0	0	0	0
Trade receivables - third party and affiliates	0	0
Non-trade receivables, net	36	35
Inventories, net	0	0
Deferred income taxes	0	0
Marketable securities, at fair value	0	0
Other assets	0	0
Total current assets	36	35
Investments in affiliates	2,825	2,784
Property, plant and equipment	0	0
Deferred income taxes	0	0
Other assets	0	0
Goodwill	0	0
Intangible assets, net	0	0
Total assets	2,861	2,819
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	0	0
Trade payables - third party and affiliates	0	0
Other liabilities	0	1
Deferred income taxes	0	0
Income taxes payable	0	0
Total current liabilities	0	1
Noncurrent Liabilities
Long-term debt	0	0
Deferred income taxes	0	0
Uncertain tax positions	0	0
Benefit obligations	0	0
Other liabilities	0	0
Total noncurrent liabilities	0	0
Total Celanese Corporation stockholders' equity	2,861	2,818
Noncontrolling interests	0	0
Total equity	2,861	2,818
Total liabilities and equity	2,861	2,819
Issuer [Member]
Current Assets
Cash and cash equivalents	0	0	0	0
Trade receivables - third party and affiliates	0	0
Non-trade receivables, net	978	477
Inventories, net	0	0
Deferred income taxes	0	0
Marketable securities, at fair value	0	0
Other assets	0	6
Total current assets	978	483
Investments in affiliates	5,926	5,889
Property, plant and equipment	0	0
Deferred income taxes	16	16
Other assets	103	674
Goodwill	0	0
Intangible assets, net	0	0
Total assets	7,023	7,062
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	1,928	1,894
Trade payables - third party and affiliates	0	0
Other liabilities	41	34
Deferred income taxes	22	22
Income taxes payable	0	0
Total current liabilities	1,991	1,950
Noncurrent Liabilities
Long-term debt	2,201	2,269
Deferred income taxes	0	0
Uncertain tax positions	6	6
Benefit obligations	0	0
Other liabilities	0	53
Total noncurrent liabilities	2,207	2,328
Total Celanese Corporation stockholders' equity	2,825	2,784
Noncontrolling interests	0	0
Total equity	2,825	2,784
Total liabilities and equity	7,023	7,062
Subsidiary Guarantors [Member]
Current Assets
Cash and cash equivalents	56	110	248	284
Trade receivables - third party and affiliates	192	184
Non-trade receivables, net	2,243	2,265
Inventories, net	273	268
Deferred income taxes	26	39
Marketable securities, at fair value	29	32
Other assets	13	12
Total current assets	2,832	2,910
Investments in affiliates	3,959	4,349
Property, plant and equipment	1,049	1,029
Deferred income taxes	235	211
Other assets	154	146
Goodwill	314	314
Intangible assets, net	72	73
Total assets	8,615	9,032
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	704	184
Trade payables - third party and affiliates	311	413
Other liabilities	178	225
Deferred income taxes	0	0
Income taxes payable	538	484
Total current liabilities	1,731	1,306
Noncurrent Liabilities
Long-term debt	371	900
Deferred income taxes	4	0
Uncertain tax positions	28	16
Benefit obligations	885	923
Other liabilities	120	121
Total noncurrent liabilities	1,408	1,960
Total Celanese Corporation stockholders' equity	5,476	5,766
Noncontrolling interests	0	0
Total equity	5,476	5,766
Total liabilities and equity	8,615	9,032
Non-Guarantors [Member]
Current Assets
Cash and cash equivalents	795	670	750	700
Trade receivables - third party and affiliates	815	821
Non-trade receivables, net	394	407
Inventories, net	566	613
Deferred income taxes	11	12
Marketable securities, at fair value	0	0
Other assets	38	34
Total current assets	2,619	2,557
Investments in affiliates	707	613
Property, plant and equipment	2,636	2,704
Deferred income taxes	24	26
Other assets	347	400
Goodwill	386	435
Intangible assets, net	51	59
Total assets	6,770	6,794
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	252	290
Trade payables - third party and affiliates	556	548
Other liabilities	324	402
Deferred income taxes	6	7
Income taxes payable	30	45
Total current liabilities	1,168	1,292
Noncurrent Liabilities
Long-term debt	205	208
Deferred income taxes	126	141
Uncertain tax positions	128	137
Benefit obligations	259	288
Other liabilities	168	192
Total noncurrent liabilities	886	966
Total Celanese Corporation stockholders' equity	4,378	4,276
Noncontrolling interests	338	260
Total equity	4,716	4,536
Total liabilities and equity	6,770	6,794
Eliminations [Member]
Current Assets
Cash and cash equivalents	0	0	0	0
Trade receivables - third party and affiliates	(203)	(204)
Non-trade receivables, net	(3,443)	(2,943)
Inventories, net	(95)	(99)
Deferred income taxes	(22)	(22)
Marketable securities, at fair value	0	0
Other assets	(6)	(19)
Total current assets	(3,769)	(3,287)
Investments in affiliates	(12,613)	(12,759)
Property, plant and equipment	0	0
Deferred income taxes	0	0
Other assets	(261)	(843)
Goodwill	0	0
Intangible assets, net	0	0
Total assets	(16,643)	(16,889)
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	(2,756)	(2,231)
Trade payables - third party and affiliates	(203)	(204)
Other liabilities	(201)	(230)
Deferred income taxes	(22)	(22)
Income taxes payable	(513)	(524)
Total current liabilities	(3,695)	(3,211)
Noncurrent Liabilities
Long-term debt	(241)	(769)
Deferred income taxes	0	0
Uncertain tax positions	0	0
Benefit obligations	0	0
Other liabilities	(28)	(83)
Total noncurrent liabilities	(269)	(852)
Total Celanese Corporation stockholders' equity	(12,679)	(12,826)
Noncontrolling interests	0	0
Total equity	(12,679)	(12,826)
Total liabilities and equity	$ (16,643)	$ (16,889)