Earnings Per Share of Common Stock Earnings Per Share Reconciliation (Details) - USD ($) $ in Millions		3 Months Ended
	Aug. 31, 2017	Mar. 31, 2017
Predecessor [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income from Continuing Operations after Income Taxes, attributable to DuPont		$ 1,171
Preferred Dividends		(2)
Income from continuing operations after income taxes available to DuPont common stockholders		1,169
Loss from Discontinued Operations after income taxes available to DuPont common stockholders		(58)
Net Income Available to Common Stockholders		$ 1,111
Weighted Average Number of Shares Outstanding, Basic		866,516,000
Dilutive effect of the company's employee compensation plans		4,567,000
Weighted Average Number of Shares Outstanding, Diluted		871,083,000
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