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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Line Items]
Income from discontinued operations after income taxes	$ 0	$ 4	$ 0	$ 1,972
Earnings Per Share Numerator [Member]
Earnings Per Share [Line Items]
Income from continuing operations after income taxes attributable to DuPont	1,070	1,026	2,509	2,406
Preferred dividends	(3)	(2)	(5)	(5)
Income from continuing operations after income taxes available to DuPont common stockholders	1,067	1,024	2,504	2,401
Income from discontinued operations after income taxes	0	4	0	1,972
Net income available to common stockholders	$ 1,067	$ 1,028	$ 2,504	$ 4,373
Earnings Per Share Denominator [Member]
Earnings Per Share [Line Items]
Weighted-average number of common shares outstanding - Basic	918,684,000	922,684,000	921,058,000	925,500,000
Dilutive effect of the company's employee compensation plans	6,903,000	6,796,000	7,087,000	6,811,000
Weighted average number of common shares outstanding - Diluted	925,587,000	929,480,000	928,145,000	932,311,000