Earnings Per Share of Common Stock (Earnings Per Share of Common Stock Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Income from continuing operations after income taxes attributable to DuPont	$ 1,330	$ 1,223
Preferred dividends	(2)	(2)
Income from continuing operations after income taxes available to DuPont common stockholders	1,328	1,221
(Loss) income from discontinued operations after income taxes available to DuPont common stockholders	(217)	3
Net income available to common stockholders	$ 1,111	$ 1,224
Weighted-average number of common shares outstanding - Basic	866,516,000	873,546,000
Dilutive effect of the company's employee compensation plans	4,567,000	3,705,000
Weighted average number of common shares outstanding - Diluted	871,083,000	877,251,000