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Other Liabilities (Schedule of Other Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Liabilities [Line Items]    
Accrued environmental remediation costs $ 362us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent $ 374us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Miscellaneous 1,624us-gaap_OtherAccruedLiabilitiesNoncurrent 1,700us-gaap_OtherAccruedLiabilitiesNoncurrent
Total other liabilities 13,819us-gaap_OtherLiabilitiesNoncurrent 10,179us-gaap_OtherLiabilitiesNoncurrent
Pension Plan [Member]    
Other Liabilities [Line Items]    
Accrued benefit costs (Note 17) 9,167us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ dd_PostretirementBenefitsTypeofDeferredCompensationAxis
= us-gaap_PensionPlansDefinedBenefitMember
5,575us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ dd_PostretirementBenefitsTypeofDeferredCompensationAxis
= us-gaap_PensionPlansDefinedBenefitMember
Other Long-Term Employee Benefit Plans [Member]    
Other Liabilities [Line Items]    
Accrued benefit costs (Note 17) $ 2,666us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ dd_PostretirementBenefitsTypeofDeferredCompensationAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
$ 2,530us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ dd_PostretirementBenefitsTypeofDeferredCompensationAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember