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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Income from continuing operations after income taxes attributable to DuPont	$ 852	$ 1,023	$ 2,182	$ 2,246
Preferred dividends	(3)	(3)	(5)	(5)
Income from continuing operations after income taxes available to DuPont common stockholders	849	1,020	2,177	2,241
Income (loss) from discontinued operations after income taxes available to DuPont common stockholders	10	(3)	(207)	0
Net income available to common stockholders	$ 859	$ 1,017	$ 1,970	$ 2,241
Weighted-average number of common shares outstanding - Basic	868,481,000	875,013,000	867,496,000	874,269,000
Dilutive effect of the company's employee compensation plans	4,269,000	4,166,000	4,424,000	3,945,000
Weighted average number of common shares outstanding - Diluted	872,750,000	879,179,000	871,920,000	878,214,000