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Benefit Obligations (Schedule of Percentage of US and International Fair Value of Plan Assets) (Details)
Dec. 31, 2014
Dec. 31, 2013
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Assets Percentage 100.00%ce_DefinedBenefitPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 100.00%ce_DefinedBenefitPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
United States Pension Plan of US Entity [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Assets Percentage 88.00%ce_DefinedBenefitPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember		 88.00%ce_DefinedBenefitPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Foreign Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Assets Percentage 12.00%ce_DefinedBenefitPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember		 12.00%ce_DefinedBenefitPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember