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Stockholders' Equity Stockholders' Equity (Noncontrolling Interest) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2012
May 01, 2012
Noncontrolling Interest [Line Items]          
Payments for noncontrolling interests $ 0us-gaap_PaymentsToMinorityShareholders $ 65us-gaap_PaymentsToMinorityShareholders $ 470us-gaap_PaymentsToMinorityShareholders    
Deferred tax liability 4,076us-gaap_DeferredTaxLiabilities 4,233us-gaap_DeferredTaxLiabilities      
Solae LLC Joint Venture [Member]          
Noncontrolling Interest [Line Items]          
Noncontrolling interest, ownership percentage by noncontrolling owners         28.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= dd_SolaeLlcJointVentureMember
Payments for noncontrolling interests       447us-gaap_PaymentsToMinorityShareholders
/ us-gaap_BusinessAcquisitionAxis
= dd_SolaeLlcJointVentureMember
 
Carrying value of noncontrolling interest in joint venture         378us-gaap_MinorityInterestInJointVentures
/ us-gaap_BusinessAcquisitionAxis
= dd_SolaeLlcJointVentureMember
Deferred tax liability         78us-gaap_DeferredTaxLiabilities
/ us-gaap_BusinessAcquisitionAxis
= dd_SolaeLlcJointVentureMember
Increase to additional paid-in capital       $ 9us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent
/ us-gaap_BusinessAcquisitionAxis
= dd_SolaeLlcJointVentureMember