Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 15, 2015
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Entity Registrant Name	DUPONT E I DE NEMOURS & CO
Entity Central Index Key	0000030554
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		876,407,000