Earnings Per Share of Common Stock (Earnings Per Share of Common Stock Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Income from continuing operations after income taxes attributable to DuPont	$ 1,023	$ 969	$ 2,246	$ 1,986
Preferred dividends	(3)	(3)	(5)	(5)
Income from continuing operations after income taxes available to DuPont common stockholders	1,020	966	2,241	1,981
Loss from discontinued operations after income taxes available to DuPont common stockholders	(3)	(29)	0	(15)
Net income available to common stockholders	$ 1,017	$ 937	$ 2,241	$ 1,966
Weighted-average number of common shares outstanding - Basic	875,013,000	905,761,000	874,269,000	906,296,000
Dilutive effect of the company's employee compensation plans	4,166,000	5,920,000	3,945,000	6,452,000
Weighted average number of common shares outstanding - Diluted	879,179,000	911,681,000	878,214,000	912,748,000