Earnings Per Share of Common Stock (Earnings Per Share of Common Stock Reconciliation) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Income from continuing operations after income taxes attributable to DuPont	$ 433	$ 260	$ 2,942	$ 2,666
Preferred dividends	(2)	(3)	(7)	(8)
Income from continuing operations after income taxes available to DuPont common stockholders	431	257	2,935	2,658
Income from discontinued operations after income taxes	0	25	0	1,997
Net income available to common stockholders	$ 431	$ 282	$ 2,935	$ 4,655
Weighted-average number of common shares outstanding - Basic	910,764,000	925,645,000	917,589,000	925,548,000
Dilutive effect of the company's employee compensation plans	6,997,000	7,360,000	7,057,000	6,994,000
Weighted average number of common shares outstanding - Diluted	917,761,000	933,005,000	924,646,000	932,542,000