Earnings Per Share of Common Stock (Earnings Per Share of Common Stock Reconciliation) (Details) (USD $) In Millions, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net income attributable to DuPont	$ 1,218	$ 1,159	$ 2,649	$ 2,288
Preferred dividends	(2)	(2)	(5)	(5)
Net income available to Dupont common stockholders	$ 1,216	$ 1,157	$ 2,644	$ 2,283
Weighted-average number of common shares - Basic	930,798,000	907,099,000	927,860,000	906,289,000
Dilutive effect of the company's employee compensation plans	13,189,000	7,449,000	14,601,000	6,927,000
Weighted average number of common shares - Diluted	943,987,000	914,548,000	942,461,000	913,216,000