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Stockholders' Equity (Share Repurchase Program) (Narrative) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 12 Months Ended | 5 Months Ended | 132 Months Ended | 1 Months Ended | 6 Months Ended | 33 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014 | Dec. 31, 2014 | Jun. 30, 2012 | Feb. 28, 2013 | Jun. 30, 2013 | Dec. 31, 2013 | Jan. 31, 2014 | Jun. 30, 2001 | Apr. 30, 2011
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock | $ 2,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 1,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 400 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  |  |  |  |  |  |  |
Repurchased and retired, shares | 30,110 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 20,400 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 7,778 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |  |  |  |  |  |  |  |
January 2014 Buyback Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share buyback plan, authorized amount |  |  |  |  |  |  |  |  |  | 5,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementClassOfStockAxis = dd_January2014BuybackPlanMember |  |
Payments for Repurchase of Common Stock |  |  |  | 1,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementClassOfStockAxis = dd_January2014BuybackPlanMember |  |  |  |  |  |  |  |
Repurchased and retired, shares |  |  |  | 15,100 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = dd_January2014BuybackPlanMember |  |  |  |  |  |  |  |
August 2014 Buyback Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  |  |  |  | 700 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementClassOfStockAxis = dd_August2014BuybackPlanMember |  |  |  |  |  |  |
Repurchased and retired, shares |  |  |  |  | 10,400 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = dd_August2014BuybackPlanMember |  |  |  |  |  |  |
June 2001 Buyback Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share buyback plan, authorized amount |  |  |  |  |  |  |  |  |  |  | 2,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementClassOfStockAxis = dd_June2001BuybackPlanMember |
Repurchased and retired, shares |  |  |  |  |  | 42,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = dd_June2001BuybackPlanMember |  |  |  |  |  |
Open Market Purchases [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock | 300 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementClassOfStockAxis = dd_OpenMarketPurchasesMember |  |  |  |  |  |  |  |  |  |  |
Repurchased and retired, shares | 4,700 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = dd_OpenMarketPurchasesMember |  |  |  |  |  |  |  |  |  |  |
December 2012 Buyback Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share buyback plan, authorized amount |  |  | 1,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementClassOfStockAxis = dd_December2012BuybackPlanMember |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  |  |  |  |  |  | 1,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementClassOfStockAxis = dd_December2012BuybackPlanMember |  |  |  |  |
Repurchased and retired, shares |  |  |  |  |  |  |  | 20,400 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = dd_December2012BuybackPlanMember |  |  |  |
April 2011 Buyback Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share buyback plan, authorized amount |  |  |  |  |  |  |  |  |  |  |  | 2,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementClassOfStockAxis = dd_April2011BuybackPlanMember
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  | $ 284 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementClassOfStockAxis = dd_April2011BuybackPlanMember |  |  |
Repurchased and retired, shares |  |  |  |  |  |  |  |  | 5,500 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = dd_April2011BuybackPlanMember |  |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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