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Long-Term Employee Benefits (Contributions) (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2013
Principal U.S. Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | $ 0 us-gaap_DefinedBenefitPlanContributionsByEmployer / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_PrincipalU.S.PensionPlanMember | $ 500 us-gaap_DefinedBenefitPlanContributionsByEmployer / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_PrincipalU.S.PensionPlanMember |
Expected 2015 contributions to principal U.S. pension plan | 50 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_PrincipalU.S.PensionPlanMember |  |  |
Pension Plan Other Than Principal Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | 190 us-gaap_DefinedBenefitPlanContributionsByEmployer / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_PensionPlanOtherThanPrincipalPlanMember |  | 197 us-gaap_DefinedBenefitPlanContributionsByEmployer / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_PensionPlanOtherThanPrincipalPlanMember
Employer Contributions in 2015 | about the same |  |  |
Remaining pension plans with no plan assets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | 121 us-gaap_DefinedBenefitPlanContributionsByEmployer / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_RemainingpensionplanswithnoplanassetsMember |  | 116 us-gaap_DefinedBenefitPlanContributionsByEmployer / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_RemainingpensionplanswithnoplanassetsMember
Employer Contributions in 2015 | about the same |  |  |
Other Postretirement Benefit Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | $ 233 us-gaap_DefinedBenefitPlanContributionsByEmployer / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  | $ 207 us-gaap_DefinedBenefitPlanContributionsByEmployer / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Employer Contributions in 2015 | about the same |  |  |

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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