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Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock based compensation cost | $ 151 us-gaap_AllocatedShareBasedCompensationExpense | $ 129 us-gaap_AllocatedShareBasedCompensationExpense | $ 105 us-gaap_AllocatedShareBasedCompensationExpense |
Income tax benefits related to stock-based compensation arrangements | $ 50 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ 43 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ 35 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |
Equity and Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares each share counts against maximum once base threshold is exceeded |  |  |  | 4.5 dd_NumberOfSharesEachShareCountsAgainstMaximumOnceBaseThresholdIsExceeded / us-gaap_AwardTypeAxis = dd_EquityAndIncentivePlanMember
Equity and Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum Number Of Shares Reserved For Grant Or Settlement Of Awards |  |  |  | 110,000,000 dd_MaximumNumberOfSharesReservedForGrantOrSettlementOfAwards / us-gaap_PlanNameAxis = dd_EquityAndIncentivePlanMember
Shares in excess must be counted against maximum number of shares granted |  |  |  | 30,000,000 dd_ThresholdForWhichSharesIssuedMustBeCountedAgainstMaximumSharesReserved / us-gaap_PlanNameAxis = dd_EquityAndIncentivePlanMember
Shares authorized for future grants | 45,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = dd_EquityAndIncentivePlanMember |  |  |

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- Definition Number Of Shares Each Share Counts Against maximum Once Base Threshold Is Exceeded + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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