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Environmental (Schedule of Environmental Ownership and Liability Percentages) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Environmental Disclosure [Line Items]    
Ownership percentage 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage  
Reserves $ 84us-gaap_AccrualForEnvironmentalLossContingencies $ 97us-gaap_AccrualForEnvironmentalLossContingencies
InfraServ GmbH & Co. Gendorf KG [Member]    
Environmental Disclosure [Line Items]    
Ownership percentage 39.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ce_InfraservGmbhCoGendorfKgMember		  
Liability percentage 10.00%ce_EnvironmentalLiabilityPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ce_InfraservGmbhCoGendorfKgMember		  
Reserves 13us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ce_InfraservGmbhCoGendorfKgMember		 [1]  
InfraServ GmbH & Co. Knapsack KG [Member]    
Environmental Disclosure [Line Items]    
Ownership percentage 27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ce_InfraservGmbhCoKnapsackKgMember		  
Liability percentage 22.00%ce_EnvironmentalLiabilityPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ce_InfraservGmbhCoKnapsackKgMember		  
Reserves 1us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ce_InfraservGmbhCoKnapsackKgMember		 [1]  
InfraServ GmbH & Co. Hoechst KG [Member]    
Environmental Disclosure [Line Items]    
Ownership percentage 32.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ce_InfraservGmbhCoHoechstKgMember		  
Liability percentage 40.00%ce_EnvironmentalLiabilityPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ce_InfraservGmbhCoHoechstKgMember		  
Reserves $ 70us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ce_InfraservGmbhCoHoechstKgMember		 [1]  
[1] Gross reserves maintained by the respective InfraServ entity.