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Other (Charges) Gains, Net (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Other (Charges) Gains, Net [Line Items]    
Employee termination benefits $ (4)ce_OneTimeTerminationBenefits $ (2)ce_OneTimeTerminationBenefits
Commercial dispute resolution (1)ce_Commercialdisputeresolution 0ce_Commercialdisputeresolution
Acetyl Intermediates [Member]    
Other (Charges) Gains, Net [Line Items]    
Commercial dispute resolution (1)ce_Commercialdisputeresolution
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember		  
Roussillon, France and Tarragona, Spain [Member] | Acetyl Intermediates [Member]    
Other (Charges) Gains, Net [Line Items]    
Employee termination benefits   $ (2)ce_OneTimeTerminationBenefits
/ dei_EntityByLocationAxis
= ce_RoussillonFranceandTarragonaSpainMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember