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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) |

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