Consolidating Guarantor Financial Information (Schedule of Consolidating Cash Flow Statements) (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 cash provided by (used in) operating activities	$ 962	$ 762	$ 722
Investing Activities
Capital expenditures on property, plant and equipment	(254)	(277)	(349)
Acquisitions, net of cash acquired	(10)	0	(23)
Proceeds from sale of businesses and assets, net	0	13	1
Deferred proceeds from Kelsterbach plant relocation	0ce_DeferredProceedsOnPlantRelocation	0ce_DeferredProceedsOnPlantRelocation	0ce_DeferredProceedsOnPlantRelocation
Capital expenditures related to Kelsterbach plant relocation	0	(7)	(49)
Capital expenditures related to Fairway Methanol LLC	(424)ce_CapitalExpendituresRelatedToVentures	(93)ce_CapitalExpendituresRelatedToVentures	(12)ce_CapitalExpendituresRelatedToVentures
Return of capital from subsidiary	0ce_ReturnOfCapitalFromSubsidiary	0ce_ReturnOfCapitalFromSubsidiary	0ce_ReturnOfCapitalFromSubsidiary
Contributions to subsidiary	0	0	0
Intercompany loan receipts (disbursements)	0	0	0
Other, net	(17)	(58)	(68)
Net cash provided by (used in) investing activities	(705)	(422)	(500)
Financing Activities
Short-term borrowings (repayments), net	(9)	(11)	2
Proceeds from short-term borrowings	62us-gaap_ProceedsFromShortTermDebt	177us-gaap_ProceedsFromShortTermDebt	71us-gaap_ProceedsFromShortTermDebt
Repayments of short-term borrowings	(91)us-gaap_RepaymentsOfShortTermDebt	(123)us-gaap_RepaymentsOfShortTermDebt	(71)us-gaap_RepaymentsOfShortTermDebt
Proceeds from long-term debt	387	74	550
Repayments of long-term debt	(626)us-gaap_RepaymentsOfLongTermDebt	(198)us-gaap_RepaymentsOfLongTermDebt	(489)us-gaap_RepaymentsOfLongTermDebt
Purchases of treasury stock, including related fees	(250)	(164)	(45)
Dividends to parent	0	0	0
Contributions from parent	0	0	0
Stock option exercises	5	9	62
Series A common stock dividends	(144)us-gaap_PaymentsOfDividendsCommonStock	(83)us-gaap_PaymentsOfDividendsCommonStock	(43)us-gaap_PaymentsOfDividendsCommonStock
Return of capital to parent	0us-gaap_PaymentsOfCapitalDistribution	0us-gaap_PaymentsOfCapitalDistribution	0us-gaap_PaymentsOfCapitalDistribution
Contributions from noncontrolling interests	264	0	0
Other, net	(13)	(7)	12
Net cash provided by (used in) financing activities	(415)	(326)	49
Exchange rate effects on cash and cash equivalents	(46)	11	6
Net increase (decrease) in cash and cash equivalents	(204)	25	277
Cash and cash equivalents as of beginning of period	984	959	682
Cash and cash equivalents as of end of period	780	984	959
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	389	228	7
Investing Activities
Capital expenditures on property, plant and equipment	0	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sale of businesses and assets, net	0	0	0
Deferred proceeds from Kelsterbach plant relocation	0	0	0
Capital expenditures related to Kelsterbach plant relocation	0	0	0
Capital expenditures related to Fairway Methanol LLC	0	0	0
Return of capital from subsidiary	0	0	0
Contributions to subsidiary	0	0	0
Intercompany loan receipts (disbursements)	0	0	0
Other, net	0	0	0
Net cash provided by (used in) investing activities	0	0	0
Financing Activities
Short-term borrowings (repayments), net	0	0	0
Proceeds from short-term borrowings	0	0	0
Repayments of short-term borrowings	0	0	0
Proceeds from long-term debt	0	0	0
Repayments of long-term debt	0	0	0
Purchases of treasury stock, including related fees	(250)	(164)	(45)
Dividends to parent	0	0	0
Contributions from parent	0	0	0
Stock option exercises	5	9	62
Series A common stock dividends	(144)	(83)	(43)
Return of capital to parent	0	0	0
Contributions from noncontrolling interests	0	0	0
Other, net	0	0	29
Net cash provided by (used in) financing activities	(389)	(238)	3
Exchange rate effects on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	(10)	10
Cash and cash equivalents as of beginning of period	0	10	0
Cash and cash equivalents as of end of period	0	0	10
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	498	105	(100)
Investing Activities
Capital expenditures on property, plant and equipment	0	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sale of businesses and assets, net	0	0	0
Deferred proceeds from Kelsterbach plant relocation	0	0	0
Capital expenditures related to Kelsterbach plant relocation	0	0	0
Capital expenditures related to Fairway Methanol LLC	0	0	0
Return of capital from subsidiary	28	0	0
Contributions to subsidiary	0	0	0
Intercompany loan receipts (disbursements)	(70)	5	5
Other, net	0	0	0
Net cash provided by (used in) investing activities	(42)	5	5
Financing Activities
Short-term borrowings (repayments), net	93	131	53
Proceeds from short-term borrowings	0	0	0
Repayments of short-term borrowings	0	0	0
Proceeds from long-term debt	462	24	500
Repayments of long-term debt	(611)	(34)	(414)
Purchases of treasury stock, including related fees	0	0	0
Dividends to parent	(390)	(229)	(35)
Contributions from parent	0	0	0
Stock option exercises	0	0	0
Series A common stock dividends	0	0	0
Return of capital to parent	0	0	0
Contributions from noncontrolling interests	0	0	0
Other, net	(10)	(2)	(9)
Net cash provided by (used in) financing activities	(456)	(110)	95
Exchange rate effects on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents as of beginning of period	0	0	0
Cash and cash equivalents as of end of period	0	0	0
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	644	766	396
Investing Activities
Capital expenditures on property, plant and equipment	(183)	(156)	(158)
Acquisitions, net of cash acquired	(10)	0	(23)
Proceeds from sale of businesses and assets, net	0	0	1
Deferred proceeds from Kelsterbach plant relocation	0	0	0
Capital expenditures related to Kelsterbach plant relocation	0	0	0
Capital expenditures related to Fairway Methanol LLC	(44)	(93)	(12)
Return of capital from subsidiary	51	0	0
Contributions to subsidiary	(213)	(20)	(3)
Intercompany loan receipts (disbursements)	(93)	(131)	(53)
Other, net	(9)	(45)	(9)
Net cash provided by (used in) investing activities	(501)	(445)	(257)
Financing Activities
Short-term borrowings (repayments), net	6	(8)	5
Proceeds from short-term borrowings	0	0	0
Repayments of short-term borrowings	0	0	0
Proceeds from long-term debt	75	50	50
Repayments of long-term debt	(5)	(121)	(10)
Purchases of treasury stock, including related fees	0	0	0
Dividends to parent	(390)	(229)	(35)
Contributions from parent	0	0	0
Stock option exercises	0	0	0
Series A common stock dividends	0	0	0
Return of capital to parent	0	0	0
Contributions from noncontrolling interests	0	0	0
Other, net	(3)	(4)	(7)
Net cash provided by (used in) financing activities	(317)	(312)	3
Exchange rate effects on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	(174)	9	142
Cash and cash equivalents as of beginning of period	284	275	133
Cash and cash equivalents as of end of period	110	284	275
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	433	154	489
Investing Activities
Capital expenditures on property, plant and equipment	(71)	(121)	(191)
Acquisitions, net of cash acquired	0	0	0
Proceeds from sale of businesses and assets, net	0	13	0
Deferred proceeds from Kelsterbach plant relocation	0	0	0
Capital expenditures related to Kelsterbach plant relocation	0	(7)	(49)
Capital expenditures related to Fairway Methanol LLC	(380)	0	0
Return of capital from subsidiary	0	0	0
Contributions to subsidiary	0	0	0
Intercompany loan receipts (disbursements)	(75)	0	0
Other, net	(8)	(13)	(59)
Net cash provided by (used in) investing activities	(534)	(128)	(299)
Financing Activities
Short-term borrowings (repayments), net	(15)	(3)	(3)
Proceeds from short-term borrowings	62	177	71
Repayments of short-term borrowings	(91)	(123)	(71)
Proceeds from long-term debt	0	0	0
Repayments of long-term debt	(15)	(48)	(70)
Purchases of treasury stock, including related fees	0	0	0
Dividends to parent	(222)	(33)	0
Contributions from parent	213	20	3
Stock option exercises	0	0	0
Series A common stock dividends	0	0	0
Return of capital to parent	(79)	0	0
Contributions from noncontrolling interests	264	0	0
Other, net	0	(1)	(1)
Net cash provided by (used in) financing activities	117	(11)	(71)
Exchange rate effects on cash and cash equivalents	(46)	11	6
Net increase (decrease) in cash and cash equivalents	(30)	26	125
Cash and cash equivalents as of beginning of period	700	674	549
Cash and cash equivalents as of end of period	670	700	674
Consolidation Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(1,002)	(491)	(70)
Investing Activities
Capital expenditures on property, plant and equipment	0	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sale of businesses and assets, net	0	0	0
Deferred proceeds from Kelsterbach plant relocation	0	0	0
Capital expenditures related to Kelsterbach plant relocation	0	0	0
Capital expenditures related to Fairway Methanol LLC	0	0	0
Return of capital from subsidiary	(79)	0	0
Contributions to subsidiary	213	20	3
Intercompany loan receipts (disbursements)	238	126	48
Other, net	0	0	0
Net cash provided by (used in) investing activities	372	146	51
Financing Activities
Short-term borrowings (repayments), net	(93)	(131)	(53)
Proceeds from short-term borrowings	0	0	0
Repayments of short-term borrowings	0	0	0
Proceeds from long-term debt	(150)	0	0
Repayments of long-term debt	5	5	5
Purchases of treasury stock, including related fees	0	0	0
Dividends to parent	1,002	491	70
Contributions from parent	(213)	(20)	(3)
Stock option exercises	0	0	0
Series A common stock dividends	0	0	0
Return of capital to parent	79	0	0
Contributions from noncontrolling interests	0	0	0
Other, net	0	0	0
Net cash provided by (used in) financing activities	630	345	19
Exchange rate effects on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents as of beginning of period	0	0	0
Cash and cash equivalents as of end of period	$ 0	$ 0	$ 0

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Amount of cash inflow (outflow) from long-term debt by a related party. Related parties, include, but are not limited to, affiliates, owners or officers and their immediate families, and pension trusts.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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