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Derivative Financial Instruments (Schedule of Changes in Fair Value of Derivatives) (Details)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended
Mar. 31, 2015
Designated as Hedging Instrument [Member]
USD ($)
Mar. 31, 2014
Designated as Hedging Instrument [Member]
USD ($)
Mar. 31, 2015
Not Designated as Hedging Instrument [Member]
USD ($)
Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
USD ($)
Mar. 31, 2015
Cross Currency Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
USD ($)
Mar. 31, 2014
Cross Currency Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
USD ($)
Mar. 31, 2015
Foreign Exchange Contract [Member]
Not Designated as Hedging Instrument [Member]
USD ($)
Mar. 31, 2014
Foreign Exchange Contract [Member]
Not Designated as Hedging Instrument [Member]
USD ($)
Mar. 31, 2015
Net Investment Hedging [Member]
USD ($)
Mar. 31, 2014
Net Investment Hedging [Member]
USD ($)
Mar. 31, 2015
Term C-2 Loan Facility [Member]
EUR (€)
Mar. 31, 2015
Term C-3 Loan Facility [Member]
EUR (€)
Mar. 31, 2015
Senior Unsecured Notes Due 2019 [Member]
Dec. 31, 2014
Senior Unsecured Notes Due 2019 [Member]
Sep. 24, 2014
Senior Unsecured Notes Due 2019 [Member]
Mar. 31, 2015
Senior Unsecured Notes Due 2019 [Member]
Net Investment Hedging [Member]
USD ($)
Mar. 31, 2014
Senior Unsecured Notes Due 2019 [Member]
Net Investment Hedging [Member]
USD ($)
Mar. 31, 2015
Term C-2 and C-3 Loan Facilities [Member]
Net Investment Hedging [Member]
USD ($)
Mar. 31, 2014
Term C-2 and C-3 Loan Facilities [Member]
Net Investment Hedging [Member]
USD ($)
Derivative [Line Items]                                      
Notional Value                     € 28invest_DerivativeNotionalAmount
/ us-gaap_DebtInstrumentAxis
= ce_TermC2LoanFacilityMember		 € 149invest_DerivativeNotionalAmount
/ us-gaap_DebtInstrumentAxis
= ce_TermC3LoanFacilityMember		              
Interest rate                         3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ce_SeniorUnsecuredNotesDue2019Member		 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ce_SeniorUnsecuredNotesDue2019Member		 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ce_SeniorUnsecuredNotesDue2019Member		        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CrossCurrencyInterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CrossCurrencyInterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		                      
Gain (Loss) Recognized in Earnings (Loss) 46us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 (68)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 (2)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 46us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CrossCurrencyInterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CrossCurrencyInterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 (68)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 (2)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		                      
Gain (Loss) Recognized in Other Comprehensive Income (Loss)                 49ce_GainLossOnNonDerivativeUsedInNetInvestmentHedge
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember		 0ce_GainLossOnNonDerivativeUsedInNetInvestmentHedge
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember		           41ce_GainLossOnNonDerivativeUsedInNetInvestmentHedge
/ us-gaap_DebtInstrumentAxis
= ce_SeniorUnsecuredNotesDue2019Member
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember		 0ce_GainLossOnNonDerivativeUsedInNetInvestmentHedge
/ us-gaap_DebtInstrumentAxis
= ce_SeniorUnsecuredNotesDue2019Member
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember		 8ce_GainLossOnNonDerivativeUsedInNetInvestmentHedge
/ us-gaap_DebtInstrumentAxis
= ce_TermC2andC3LoanFacilitiesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember		 [1] 0ce_GainLossOnNonDerivativeUsedInNetInvestmentHedge
/ us-gaap_DebtInstrumentAxis
= ce_TermC2andC3LoanFacilitiesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember
Gain (Loss) Recognized in Earnings (Loss)                 $ 0us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember		 $ 0us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember		           $ 0us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges
/ us-gaap_DebtInstrumentAxis
= ce_SeniorUnsecuredNotesDue2019Member
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember		 $ 0us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges
/ us-gaap_DebtInstrumentAxis
= ce_SeniorUnsecuredNotesDue2019Member
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember		 $ 0us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges
/ us-gaap_DebtInstrumentAxis
= ce_TermC2andC3LoanFacilitiesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember		 $ 0us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges
/ us-gaap_DebtInstrumentAxis
= ce_TermC2andC3LoanFacilitiesMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember
[1] During the three months ended March 31, 2015, the Company designated the €28 million principal amount of its Term C-2 loan and €149 million of its Term C-3 loan as a net investment hedge of its investment in a wholly-owned international subsidiary whose functional currency is the Euro to mitigate the volatility caused by the changes in foreign currency exchange rates of the Euro with respect to the US dollar.