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Plant Relocation (Narrative) (Details) (Advanced Engineered Materials [Member], Kelsterbach, Germany [Member], EUR €)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Nov. 30, 2006
Dec. 31, 2014
Advanced Engineered Materials [Member] | Kelsterbach, Germany [Member]
    
Plant Relocation [Line Items]    
Proceeds originally expected under plant relocation agreement € 670ce_ProceedsOriginallyExpectedUnderPlantRelocationAgreement
/ dei_EntityByLocationAxis
= ce_KelsterbachGermanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AdvancedEngineeredMaterialsMember		 € 652ce_ProceedsOriginallyExpectedUnderPlantRelocationAgreement
/ dei_EntityByLocationAxis
= ce_KelsterbachGermanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AdvancedEngineeredMaterialsMember