(Earnings Per Share of Common Stock Reconciliation) (Details) - Predecessor - USD ($) $ in Millions	2 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
	Aug. 31, 2017	Sep. 30, 2016	Aug. 31, 2017	Sep. 30, 2016
(Loss) income from continuing operations after income taxes attributable to DuPont	$ (263)	$ (70)	$ 1,624	$ 1,902
Preferred dividends	(2)	(2)	(7)	(7)
(Loss) income from continuing operations after income taxes available to DuPont common stockholders	(265)	(72)	1,617	1,895
Income from discontinued operations after income taxes available to DuPont common stockholders	29	72	117	346
Net (loss) income available to common stockholders	$ (236)	$ 0	$ 1,734	$ 2,241
Weighted-average number of common shares outstanding - Basic	868,992,000	874,292,000	867,888,000	874,274,000
Dilutive effect of the company's employee compensation plans	0	5,099,000	4,532,000	4,332,000
Weighted average number of common shares outstanding - Diluted	868,992,000	879,391,000	872,420,000	878,606,000