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Divestitures and Other Transactions (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Separation related transaction costs   $ 7
Food Safety Diagnostic Business [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 162  
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Net of tax 86  
Ownership interest in DuPont (Shenzhen) Manufacturing Limited [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Gain on sale of entity   369
Gain on sale of entity, after-tax   $ 214
Ownership interest in an entity   100.00%
Accounts and Notes Receivable [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Indemnification assets 422  
Other Assets [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Indemnification assets 350  
PFOA Matters [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Indemnification assets 350  
Discontinued Operations [Member] | PFOA Matters [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Loss Contingency, Loss in Period (335)  
Loss Contingency, Loss in Period, after tax $ (224)