Document and Entity Information	9 Months Ended
	Sep. 30, 2017 shares
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
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	2017
Document Fiscal Period Focus	Q3
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	100