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Earnings Per Share of Common Stock (Earnings Per Share of Common Stock Reconciliation) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Earnings Per Share [Abstract] |  |
Income from continuing operations after income taxes attributable to DuPont | $ 1,330 | $ 1,223
Preferred dividends | (2) | (2)
Income from continuing operations after income taxes available to DuPont common stockholders | 1,328 | 1,221
(Loss) income from discontinued operations after income taxes available to DuPont common stockholders | (217) | 3
Net income available to common stockholders | $ 1,111 | $ 1,224
Weighted-average number of common shares outstanding - Basic | 866,516,000 | 873,546,000
Dilutive effect of the company's employee compensation plans | 4,567,000 | 3,705,000
Weighted average number of common shares outstanding - Diluted | 871,083,000 | 877,251,000

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