Earnings Per Share of Common Stock (Earnings Per Share of Common Stock Reconciliation) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share Numerator [Member]
Earnings Per Share [Line Items]
Income from continuing operations after income taxes attributable to DuPont	$ 1,380	$ 1,397
Preferred dividends	(3)	(3)
Income from continuing operations after income taxes available to DuPont common stockholders	1,377	1,394
Income from discontinued operations after income taxes	1,968	95
Net income available to common stockholders	$ 3,345	$ 1,489
Earnings Per Share Denominator [Member]
Earnings Per Share [Line Items]
Weighted-average number of common shares - Basic	928,348	933,910
Dilutive effect of the company's employee compensation plans	7,042	10,328
Weighted average number of common shares outstanding - Diluted	935,390	944,238

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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+ Details

- Definition

Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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-Name Statement of Financial Accounting Standard (FAS)

-Number 128

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-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 07-4

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details