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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
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Jun. 30, 2014 USD ($) | Dec. 31, 2014 Minimum [Member] | Dec. 31, 2014 Minimum [Member] Equipment and Buildings [Member] | Dec. 31, 2014 Minimum [Member] Computer Software, Intangible Asset [Member] | Dec. 31, 2014 Maximum [Member] | Dec. 31, 2014 Maximum [Member] Equipment and Buildings [Member] | Dec. 31, 2014 Maximum [Member] Computer Software, Intangible Asset [Member] | Dec. 31, 2014 Fair Value, Inputs, Level 1 [Member] USD ($) | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] USD ($) | Dec. 31, 2014 Level 2 Inputs [Member] USD ($) | Dec. 31, 2013 Level 2 Inputs [Member] USD ($) | Dec. 31, 2014 Foreign exchange rate - Bolivar [Member] VEF | Jun. 30, 2014 Foreign exchange rate - SICAD 2 [Member] VEF
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Official currency exchange rate in Venezuela |  |  |  |  |  |  |  |  |  |  |  | 6.3 dd_OfficialcurrencyexchangerateinVenezuela / dd_ForeignCurrencyExchangeratesAxis = dd_ForeignexchangerateBolivarMember |
SICAD 2 Venezuelan foreign currency exchange rate |  |  |  |  |  |  |  |  |  |  |  |  | 49.98 dd_SICAD2Venezuelanforeigncurrencyexchangerate / dd_ForeignCurrencyExchangeratesAxis = dd_ForeignexchangerateSICAD2Member
Fair value of cash equivalents |  |  |  |  |  |  |  | 1,436,000,000 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 5,116,000,000 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 3,293,000,000 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 2,256,000,000 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Held-to-maturity, marketable securities, maturity timing in months |  | 3 months |  |  | 12 months |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 15 years | 5 years |  | 25 years | 7 years |  |  |  |  |  |
Definite-lived intangible assets, useful life |  | 1 year |  |  | 20 years |  |  |  |  |  |  |  |
Asset retirement obligations, useful life |  | 1 year |  |  | 25 years |  |  |  |  |  |  |  |
SICAD 2 pre-tax charge | $ 58,000,000 dd_SICAD2pretaxcharge |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Held-to-maturity, marketable securities, maturity timing + References No definition available. + Details
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- Definition Official currency exchange rate in Venezuela set through the National Center for Foreign Commerce. + References No definition available. + Details
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- Definition Pre-tax charge related to the remeasurement of the company's BsF denominated net monetary assets using the SICAD 2 rate. + References No definition available. + Details
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- Definition The SICAD 2 Venezuelan foreign currency exchange rate. + References No definition available. + Details
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- Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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