Earnings Per Share of Common Stock (Earnings Per Share of Common Stock Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Income from continuing operations after income taxes attributable to DuPont	$ 131	$ 330	$ 2,117	$ 2,558
Preferred dividends	(2)	(2)	(7)	(7)
Income from continuing operations after income taxes available to DuPont common stockholders	129	328	2,110	2,551
Income from discontinued operations after income taxes available to DuPont common stockholders	104	103	89	384
Net income available to common stockholders	$ 233	$ 431	$ 2,199	$ 2,935
Weighted-average number of common shares outstanding - Basic	887,275,000	910,764,000	899,883,000	917,589,000
Dilutive effect of the company's employee compensation plans	4,011,000	6,997,000	5,639,000	7,057,000
Weighted average number of common shares outstanding - Diluted	891,286,000	917,761,000	905,522,000	924,646,000