Earnings Per Share of Common Stock (Earnings Per Share of Common Stock Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Income from continuing operations after income taxes attributable to DuPont	$ 1,223	$ 1,017
Preferred dividends	(2)	(2)
Income from continuing operations after income taxes available to DuPont common stockholders	1,221	1,015
Income from discontinued operations after income taxes available to DuPont common stockholders	3	14
Net income available to common stockholders	$ 1,224	$ 1,029
Weighted-average number of common shares outstanding - Basic	873,546,000	906,835,000
Dilutive effect of the company's employee compensation plans	3,705,000	6,984,000
Weighted average number of common shares outstanding - Diluted	877,251,000	913,819,000