Consolidating Guarantor Financial Information (Schedule of Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 988	$ 780	$ 1,064	$ 984
Trade receivables - third party and affiliates	873	801
Non-trade receivables, net	226	241
Inventories, net	762	782
Deferred income taxes	15	29
Marketable securities, at fair value	29	32
Other assets	30	33
Total current assets	2,923	2,698
Investments in affiliates	821	876
Property, plant and equipment	3,771	3,733
Deferred income taxes	260	253
Other assets	372	377
Goodwill	716	749
Intangible assets, net	125	132
Total assets	8,988	8,818
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	123	137
Trade payables - third party and affiliates	736	757
Other liabilities	298	432
Deferred income taxes	6	7
Income taxes payable	105	5
Total current liabilities	1,268	1,338
Noncurrent Liabilities
Long-term debt	2,552	2,608
Deferred income taxes	127	141
Uncertain tax positions	164	159
Benefit obligations	1,130	1,211
Other liabilities	262	283
Total noncurrent liabilities	4,235	4,402
Total Celanese Corporation stockholders' equity	3,076	2,818
Noncontrolling interests	409	260
Total equity	3,485	3,078
Total liabilities and equity	8,988	8,818
Parent Guarantor [Member]
Current Assets
Cash and cash equivalents	1	0	2	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	37	35
Investments in affiliates	3,041	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	3,078	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	2	1
Deferred income taxes	0	0
Income taxes payable	0	0
Total current liabilities	2	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	3,076	2,818
Noncontrolling interests	0	0
Total equity	3,076	2,818
Total liabilities and equity	3,078	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	974	477
Inventories, net	0	0
Deferred income taxes	0	0
Marketable securities, at fair value	0	0
Other assets	0	6
Total current assets	974	483
Investments in affiliates	6,216	5,889
Property, plant and equipment	0	0
Deferred income taxes	16	16
Other assets	102	674
Goodwill	0	0
Intangible assets, net	0	0
Total assets	7,308	7,062
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	1,972	1,894
Trade payables - third party and affiliates	0	0
Other liabilities	18	34
Deferred income taxes	22	22
Income taxes payable	0	0
Total current liabilities	2,012	1,950
Noncurrent Liabilities
Long-term debt	2,234	2,269
Deferred income taxes	14	0
Uncertain tax positions	7	6
Benefit obligations	0	0
Other liabilities	0	53
Total noncurrent liabilities	2,255	2,328
Total Celanese Corporation stockholders' equity	3,041	2,784
Noncontrolling interests	0	0
Total equity	3,041	2,784
Total liabilities and equity	7,308	7,062
Subsidiary Guarantors [Member]
Current Assets
Cash and cash equivalents	115	110	208	284
Trade receivables - third party and affiliates	182	184
Non-trade receivables, net	2,270	2,265
Inventories, net	250	268
Deferred income taxes	26	39
Marketable securities, at fair value	29	32
Other assets	17	12
Total current assets	2,889	2,910
Investments in affiliates	4,199	4,349
Property, plant and equipment	1,022	1,029
Deferred income taxes	237	211
Other assets	154	146
Goodwill	314	314
Intangible assets, net	74	73
Total assets	8,889	9,032
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	700	184
Trade payables - third party and affiliates	354	413
Other liabilities	165	225
Deferred income taxes	0	0
Income taxes payable	542	484
Total current liabilities	1,761	1,306
Noncurrent Liabilities
Long-term debt	373	900
Deferred income taxes	0	0
Uncertain tax positions	29	16
Benefit obligations	863	923
Other liabilities	119	121
Total noncurrent liabilities	1,384	1,960
Total Celanese Corporation stockholders' equity	5,744	5,766
Noncontrolling interests	0	0
Total equity	5,744	5,766
Total liabilities and equity	8,889	9,032
Non-Guarantors [Member]
Current Assets
Cash and cash equivalents	872	670	854	700
Trade receivables - third party and affiliates	888	821
Non-trade receivables, net	382	407
Inventories, net	595	613
Deferred income taxes	11	12
Marketable securities, at fair value	0	0
Other assets	23	34
Total current assets	2,771	2,557
Investments in affiliates	721	613
Property, plant and equipment	2,749	2,704
Deferred income taxes	9	26
Other assets	395	400
Goodwill	402	435
Intangible assets, net	51	59
Total assets	7,098	6,794
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	249	290
Trade payables - third party and affiliates	579	548
Other liabilities	274	402
Deferred income taxes	6	7
Income taxes payable	71	45
Total current liabilities	1,179	1,292
Noncurrent Liabilities
Long-term debt	204	208
Deferred income taxes	115	141
Uncertain tax positions	128	137
Benefit obligations	267	288
Other liabilities	170	192
Total noncurrent liabilities	884	966
Total Celanese Corporation stockholders' equity	4,626	4,276
Noncontrolling interests	409	260
Total equity	5,035	4,536
Total liabilities and equity	7,098	6,794
Eliminations [Member]
Current Assets
Cash and cash equivalents	0	0	$ 0	$ 0
Trade receivables - third party and affiliates	(197)	(204)
Non-trade receivables, net	(3,436)	(2,943)
Inventories, net	(83)	(99)
Deferred income taxes	(22)	(22)
Marketable securities, at fair value	0	0
Other assets	(10)	(19)
Total current assets	(3,748)	(3,287)
Investments in affiliates	(13,356)	(12,759)
Property, plant and equipment	0	0
Deferred income taxes	(2)	0
Other assets	(279)	(843)
Goodwill	0	0
Intangible assets, net	0	0
Total assets	(17,385)	(16,889)
Current Liabilities
Short-term borrowings and current installments of long-term debt - third party and affiliates	(2,798)	(2,231)
Trade payables - third party and affiliates	(197)	(204)
Other liabilities	(161)	(230)
Deferred income taxes	(22)	(22)
Income taxes payable	(508)	(524)
Total current liabilities	(3,686)	(3,211)
Noncurrent Liabilities
Long-term debt	(259)	(769)
Deferred income taxes	(2)	0
Uncertain tax positions	0	0
Benefit obligations	0	0
Other liabilities	(27)	(83)
Total noncurrent liabilities	(288)	(852)
Total Celanese Corporation stockholders' equity	(13,411)	(12,826)
Noncontrolling interests	0	0
Total equity	(13,411)	(12,826)
Total liabilities and equity	$ (17,385)	$ (16,889)