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, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income attributable to DuPont	$ 1,179	$ 1,218	$ 2,667	$ 2,649
Preferred dividends	(2)	(2)	(5)	(5)
Net income available to common stockholders	$ 1,177	$ 1,216	$ 2,662	$ 2,644
Weighted-average number of common shares - Basic	934,057,000	930,798,000	933,982,000	927,860,000
Dilutive effect of the company's employee compensation plans	8,775,000	13,189,000	9,551,000	14,601,000
Weighted average number of common shares outstanding - Diluted	942,832,000	943,987,000	943,533,000	942,461,000