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Other (Charges) Gains, Net (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2014
Other (Charges) Gains, Net [Line Items]          
Employee termination benefits $ 7ce_OneTimeTerminationBenefits $ 23ce_OneTimeTerminationBenefits $ 6ce_OneTimeTerminationBenefits    
Consumer Specialties [Member]          
Other (Charges) Gains, Net [Line Items]          
Commercial disputes (15)ce_Commercialdisputeresolution
/ us-gaap_StatementBusinessSegmentsAxis
= ce_ConsumerSpecialtiesMember
       
Acetyl Intermediates [Member]          
Other (Charges) Gains, Net [Line Items]          
Commercial disputes (8)ce_Commercialdisputeresolution
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember
       
Asset impairments       46us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember
 
Roussillon, France and Tarragona, Spain [Member] | Acetyl Intermediates [Member]          
Other (Charges) Gains, Net [Line Items]          
Employee termination benefits 4ce_OneTimeTerminationBenefits
/ dei_EntityByLocationAxis
= ce_RoussillonFranceandTarragonaSpainMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember
       
Roussillon, France [Member] | Acetyl Intermediates [Member]          
Other (Charges) Gains, Net [Line Items]          
Employee termination benefits       6ce_OneTimeTerminationBenefits
/ dei_EntityByLocationAxis
= ce_RoussillonFranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember
 
Contract termination costs   3ce_ContractTerminationCosts
/ dei_EntityByLocationAxis
= ce_RoussillonFranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember
     
Asset impairments         3us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ dei_EntityByLocationAxis
= ce_RoussillonFranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember
Tarragona, Spain [Member] | Acetyl Intermediates [Member]          
Other (Charges) Gains, Net [Line Items]          
Employee termination benefits       14ce_OneTimeTerminationBenefits
/ dei_EntityByLocationAxis
= ce_TarragonaSpainMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember
 
Contract termination costs 2ce_ContractTerminationCosts
/ dei_EntityByLocationAxis
= ce_TarragonaSpainMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember
30ce_ContractTerminationCosts
/ dei_EntityByLocationAxis
= ce_TarragonaSpainMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember
     
Asset impairments       31us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ dei_EntityByLocationAxis
= ce_TarragonaSpainMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_AcetylIntermediatesMember
 
Spondon, Derby, UK [Member] | Consumer Specialties [Member]          
Other (Charges) Gains, Net [Line Items]          
Employee termination benefits     5ce_OneTimeTerminationBenefits
/ dei_EntityByLocationAxis
= ce_SpondonUkMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_ConsumerSpecialtiesMember
   
Property, plant and equipment fair value     3us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ dei_EntityByLocationAxis
= ce_SpondonUkMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_ConsumerSpecialtiesMember
   
Asset impairments     8us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ dei_EntityByLocationAxis
= ce_SpondonUkMember
/ us-gaap_StatementBusinessSegmentsAxis
= ce_ConsumerSpecialtiesMember
   
Other Commercial Actions [Member]          
Other (Charges) Gains, Net [Line Items]          
Loss Contingency, Loss in Period $ 12us-gaap_LossContingencyLossInPeriod
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= ce_OtherCommercialActionsMember