Earnings Per Share of Common Stock (Earnings Per Share of Common Stock Reconciliation) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Abstract]
Income from continuing operations after income taxes attributable to DuPont	$ 2,468	$ 3,119	$ 2,724
Preferred dividends	(10)	(10)	(10)
Income from continuing operations after income taxes available to DuPont common shareholders	2,458	3,109	2,714
Income from discontinued operations after income taxes	320	355	307
Net income available to common stockholders	$ 2,778	$ 3,464	$ 3,021
Weighted-average number of common shares outstanding - Basic	933,275	928,417	908,860
Dilutive effect of the company's employee compensation plans	8,922	12,612	12,795
Weighted average number of common shares outstanding - Diluted	942,197	941,029	921,655