Long-Term Employee Benefits (Plan Assets) (Narrative) (Details)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
General Discussion of Pension and Other Postretirement Benefits [Abstract]
U.S. equity securities	28.00%	27.00%
Non-U.S. equity securities	21.00%	20.00%
Fixed income securities	29.00%	29.00%
Hedge funds	2.00%	2.00%
Private Market Securities	13.00%	14.00%
Real Estate	7.00%	8.00%
Total	100.00%	100.00%

- Definition

Target allocation percentage in fixed income securities of total plan assets as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

Name:	dd_DefinedBenefitPlanTargetAllocationPercentageDebtSecurities
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- Definition

The target allocation of all investments as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

Name:	dd_DefinedBenefitPlanTargetAllocationPercentageOfAllAssets
Namespace Prefix:	dd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Target allocation percentage in U.S. equity securities of total equity securities as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

Name:	dd_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDomesticEquitySecurities
Namespace Prefix:	dd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Target allocation percentage in non U.S. equity securities of total equity securities as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

Name:	dd_DefinedBenefitPlanTargetAllocationPercentageOfAssetsForeignEquitySecurities
Namespace Prefix:	dd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Target allocation minimum percentage in hedge funds to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

Name:	dd_DefinedBenefitPlanTargetAllocationPercentageOfAssetsHedgeFunds
Namespace Prefix:	dd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Target allocation percentage in private market securities of total plan assets as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

Name:	dd_DefinedBenefitPlanTargetAllocationPercentagePrivateMarketSecurities
Namespace Prefix:	dd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Target allocation percentage in real estate of total plan assets as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

Name:	dd_DefinedBenefitPlanTargetAllocationPercentageRealEstate
Namespace Prefix:	dd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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