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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share Numerator [Member]
Earnings Per Share [Line Items]
Income from continuing operations after income taxes attributable to DuPont	$ 1,026	$ 1,090	$ 2,406	$ 2,487
Preferred dividends	(2)	(2)	(5)	(5)
Income from continuing operations after income taxes available to DuPont common stockholders	1,024	1,088	2,401	2,482
Income from discontinued operations after income taxes	4	76	1,972	171
Net income available to common stockholders	$ 1,028	$ 1,164	$ 4,373	$ 2,653
Earnings Per Share Denominator [Member]
Earnings Per Share [Line Items]
Weighted-average number of common shares outstanding - Basic	922,684,000	934,057,000	925,500,000	933,982,000
Dilutive effect of the company's employee compensation plans	6,796,000	8,775,000	6,811,000	9,551,000
Weighted average number of common shares outstanding - Diluted	929,480,000	942,832,000	932,311,000	943,533,000