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Provision for Income Taxes Provision for Income Taxes (Schedule of Effective Income Tax Rate) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Statutory U.S. federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Exchange gains/losses 7.40%dd_EffectiveIncomeTaxRateReconciliationExchangeGainLosses [1] 0.80%dd_EffectiveIncomeTaxRateReconciliationExchangeGainLosses [1] 0.10%dd_EffectiveIncomeTaxRateReconciliationExchangeGainLosses [1]
Domestic operations (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (3.20%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (2.30%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Lower effective tax rates on international operations-net (11.30%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential [2] (12.30%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential [2] (10.90%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential [2]
Tax settlements (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements
Sale of a business (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness
U.S. research & development credit (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch [2] (2.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch [2] 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch [2]
Effective income tax rate on continuing operations 27.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 17.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 19.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations
[1] Principally reflects the impact of foreign exchange losses on net monetary assets for which no corresponding tax benefit is realized. Further information about the company's foreign currency hedging program is included in Note 19 under the heading Foreign Currency Risk.
[2] On January 2, 2013, U.S. tax law was enacted which extended through 2013 (and retroactive to 2012) several expired or expiring temporary business tax provisions. In accordance with GAAP, this extension was taken into account in the quarter in which the legislation was enacted (i.e. first quarter 2013).