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Long-Term Borrowings and Capital Lease Obligations Long-Term Borrowings and Capital Lease Obligations (Narrative) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013
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Debt Instrument [Line Items] |  |  |
Maturities of long-term borrowings, 2016 | $ 1,602 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |
Maturities of long-term borrowings, 2017 | 4 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |
Maturities of long-term borrowings, 2018 | 1,343 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |
Maturities of long-term borrowings, 2019 | 503 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |
Maturities of long-term borrowings, thereafter | 5,807 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |
2.80% notes due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | 1,250 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = dd_SeniorNote2point80percentnotesdue2023Member | 1,250 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = dd_SeniorNote2point80percentnotesdue2023Member | 1,250 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = dd_SeniorNote2point80percentnotesdue2023Member
Debt Instrument, Interest Rate, Stated Percentage | 2.80%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = dd_SeniorNote2point80percentnotesdue2023Member | 2.80%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = dd_SeniorNote2point80percentnotesdue2023Member | 2.80%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = dd_SeniorNote2point80percentnotesdue2023Member
4.15% notes due 2043 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | 749 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = dd_SeniorNote4point15percentdue2043Member | 749 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = dd_SeniorNote4point15percentdue2043Member | 750 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = dd_SeniorNote4point15percentdue2043Member
Debt Instrument, Interest Rate, Stated Percentage | 4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = dd_SeniorNote4point15percentdue2043Member | 4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = dd_SeniorNote4point15percentdue2043Member | 4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = dd_SeniorNote4point15percentdue2043Member
Level 2 Inputs [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fair value of long-term borrowings | $ 9,970 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | $ 11,130 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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