Earnings Per Share of Common Stock (Earnings Per Share of Common Stock Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income attributable to DuPont	$ 940	$ 1,070	$ 1,971	$ 2,509
Preferred dividends	(3)	(3)	(5)	(5)
Net income available to common stockholders	$ 937	$ 1,067	$ 1,966	$ 2,504
Weighted-average number of common shares outstanding - Basic	905,761,000	918,684,000	906,296,000	921,058,000
Dilutive effect of the company's employee compensation plans	5,920,000	6,903,000	6,452,000	7,087,000
Weighted average number of common shares outstanding - Diluted	911,681,000	925,587,000	912,748,000	928,145,000