Earnings Per Share of Common Stock Earnings Per Share Reconciliation (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Aug. 31, 2017	Jun. 30, 2017	Jun. 30, 2017
Predecessor [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income from Continuing Operations after Income Taxes, attributable to DuPont		$ 717	$ 1,888
Preferred Dividends		(3)	(5)
Income from continuing operations after income taxes available to DuPont common stockholders		714	1,883
Income from Discontinued Operations after income taxes available to DuPont common stockholders		145	87
Net Income Available to Common Stockholders		$ 859	$ 1,970
Weighted Average Number of Shares Outstanding, Basic		868,481,000	867,496,000
Dilutive effect of the company's employee compensation plans		4,269,000	4,424,000
Weighted Average Number of Shares Outstanding, Diluted		872,750,000	871,920,000
Common Stock [Member] | Merger with Dow [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share exchange ratio, DuPont to DowDuPont	1.2820