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Summary of Significant Accounting Policies Venezuelan Foreign Currency Translation (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Venezuelan Foreign Currency Translation [Abstract] |  |
SICAD 2 pre tax charge |  | $ 58
SIMADI pre-tax charge | $ 3 |

X
- Definition Pre-tax charge related to the re-measurement of the company's BsF denominated net monetary assets using the SICAD 2 rate. + References No definition available. + Details
Name: | dd_SICAD2pretaxcharge
Namespace Prefix: | dd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Pre-tax charge related to the remeasurement of the company's VEF denominated net monetary assets using the SIMADI rate. + References No definition available. + Details
Name: | dd_SIMADIpretaxcharge
Namespace Prefix: | dd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Venezuelan Foreign Currency Translation [Abstract] + References No definition available. + Details
Name: | dd_VenezuelanForeignCurrencyTranslationAbstract
Namespace Prefix: | dd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration