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Income Taxes (Schedule of Earnings (Loss) from Continuing Operations Before Tax by Jurisdiction) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]      
US $ 534us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 806us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 195us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
International 407us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign [1] 803us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign [1] 126us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign [1]
Earnings (loss) from continuing operations before tax 941us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 1,609us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 321us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Effective income tax rate 33.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 32.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations (17.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Aggregated Geographical [Member]      
Income Taxes [Line Items]      
International $ 308us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
/ us-gaap_StatementGeographicalAxis
= ce_AggregatedGeographicalMember		 $ 275us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
/ us-gaap_StatementGeographicalAxis
= ce_AggregatedGeographicalMember		 $ 320us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
/ us-gaap_StatementGeographicalAxis
= ce_AggregatedGeographicalMember
Effective income tax rate 4.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ us-gaap_StatementGeographicalAxis
= ce_AggregatedGeographicalMember		 4.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ us-gaap_StatementGeographicalAxis
= ce_AggregatedGeographicalMember		 5.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ us-gaap_StatementGeographicalAxis
= ce_AggregatedGeographicalMember
[1] Includes aggregate earnings generated by operations in Bermuda, Luxembourg, the Netherlands and Hong Kong of $308 million, $275 million and $320 million for the years ended December 31, 2014, 2013 and 2012, respectively, which have an aggregate effective income tax rate of 4.8%, 4.0% and 5.6% for each year, respectively.