Summary of Significant Accounting Policies Basis of Presentation (Details) $ in Millions	Jan. 01, 2013 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated other comprehensive loss revision for CTA	$ 97
Revision impact	$ 151

Revised accumulated other comprehensive loss to adjust for currency translation that should have been recorded in prior years.

No definition available.

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Namespace Prefix:	dd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant