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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Inventory (Narrative) (Details) | Dec. 31, 2014 | Dec. 31, 2013
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Inventory Policy [Abstract] |  |
Percentage of FIFO Inventory | 50.00%us-gaap_PercentageOfFIFOInventory | 50.00%us-gaap_PercentageOfFIFOInventory
Percentage of LIFO Inventory | 25.00%us-gaap_PercentageOfLIFOInventory | 25.00%us-gaap_PercentageOfLIFOInventory
Percentage of average cost inventory | 25.00%us-gaap_PercentageOfWeightedAverageCostInventory | 25.00%us-gaap_PercentageOfWeightedAverageCostInventory

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- Details
Name: | dd_InventoryPolicyAbstract
Namespace Prefix: | dd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of FIFO (first in first out) inventory to total inventory as of the balance sheet date if other than 100 percent. + References No definition available. + Details
Name: | us-gaap_PercentageOfFIFOInventory
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent. + References No definition available. + Details
Name: | us-gaap_PercentageOfLIFOInventory
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods. + References No definition available. + Details
Name: | us-gaap_PercentageOfWeightedAverageCostInventory
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant