DEI Document	9 Months Ended
	Sep. 30, 2018 shares
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
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	2018
Document Fiscal Period Focus	Q3
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	100
Entity Emerging Growth Company	false
Entity Small Business	false