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Commitments and Contingent Liabilities (Litigation) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2004
resident
Mar. 31, 2015
Jul. 31, 2005
Jan. 31, 2012
PFOA Matters [Member]        
Loss Contingencies [Line Items]        
Accrual balance   14us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dd_PfoaMattersMember
   
PFOA Matters: Drinking Water Actions [Member]        
Loss Contingencies [Line Items]        
Binding settlement agreement, class size 80,000dd_BindingSettlementAgreementClassSize
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dd_PfoaMattersDrinkingWaterActionsMember
     
Loss contingency, potential additional loss   235us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dd_PfoaMattersDrinkingWaterActionsMember
   
Escrow deposit       1dd_EscrowAmountPerSettlementAgreement
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dd_PfoaMattersDrinkingWaterActionsMember
PFOA Matters: Additional Actions [Member]        
Loss Contingencies [Line Items]        
Lawsuits alleging personal injury - Filed   3,500dd_LawsuitsallegingpersonalinjuryFiled
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dd_PFOAMattersAdditionalActionsMember
   
Lawsuits alleging personal injury, number of new claims filed   600us-gaap_LossContingencyNewClaimsFiledNumber
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dd_PFOAMattersAdditionalActionsMember
   
Lawsuits alleging wrongful death   32dd_LawsuitsAllegingWrongfulDeath
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dd_PFOAMattersAdditionalActionsMember
   
PFOA MDL plaintiffs   6dd_PFOAMDLplaintiffs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dd_PFOAMattersAdditionalActionsMember
   
Payment for Plaintiffs Attorney Fees [Member] | PFOA Matters: Drinking Water Actions [Member]        
Loss Contingencies [Line Items]        
Settlement payments     23us-gaap_LossContingencyAccrualCarryingValuePayments
/ us-gaap_LitigationStatusAxis
= dd_PaymentforPlaintiffsAttorneyFeesMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dd_PfoaMattersDrinkingWaterActionsMember
 
Payment to fund community health project [Member] | PFOA Matters: Drinking Water Actions [Member]        
Loss Contingencies [Line Items]        
Settlement payments     $ 70us-gaap_LossContingencyAccrualCarryingValuePayments
/ us-gaap_LitigationStatusAxis
= dd_PaymenttofundcommunityhealthprojectMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dd_PfoaMattersDrinkingWaterActionsMember