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Long-Term Employee Benefits (Defined Contribution Plan) (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2015
Other Defined Contribution Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution | $ 66 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_OtherDefinedContributionPlansMember | $ 105 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_OtherDefinedContributionPlansMember | $ 124 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_OtherDefinedContributionPlansMember |
Defined Contribution Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan estimated future employer contributions in next fiscal year |  |  |  | 340 dd_DefinedContributionPlanEstimatedFutureEmployerContributionsInNextFiscalYear / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_DefinedContributionPlansMember
Discontinued Operations [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution | 0 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = us-gaap_SegmentDiscontinuedOperationsMember | 2 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = us-gaap_SegmentDiscontinuedOperationsMember | 30 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = us-gaap_SegmentDiscontinuedOperationsMember |
U.S. Defined Contribution Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contribution | $ 262 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_USDefinedContributionPlansMember | $ 208 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_USDefinedContributionPlansMember | $ 212 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_USDefinedContributionPlansMember |
US Retirement Savings Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percent of portion of employee's contribution matched by the employer | 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_UsRetirementSavingsPlanMember |  |  |
Maximum percent of eligible compensation matched by employer | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_UsRetirementSavingsPlanMember |  |  |
Percent of eligible compensation contributed to defined contribution plan | 3.00%dd_PercentOfEligibleCompensationContributedToDefinedContributionPlan / dd_PostretirementBenefitsTypeofDeferredCompensationAxis = dd_UsRetirementSavingsPlanMember |  |  |
Requisite service period, years | 3 years 0 months 0 days |  |  |

X
- Definition Amount of employer's best estimate of contributions expected to be paid to the defined contribution plan during the next fiscal year beginning after the date of the latest statement of financial position. + References No definition available. + Details
Name: | dd_DefinedContributionPlanEstimatedFutureEmployerContributionsInNextFiscalYear
Namespace Prefix: | dd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a contribution to a defined contribution plan, regardless of the employee's contribution. + References No definition available. + Details
Name: | dd_PercentOfEligibleCompensationContributedToDefinedContributionPlan
Namespace Prefix: | dd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dd_PostretirementBenefitsTypeofDeferredCompensationAxis=dd_UsRetirementSavingsPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dd_PostretirementBenefitsTypeofDeferredCompensationAxis=us-gaap_SegmentDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |