Divestitures and Other Transactions (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Separation related transaction costs		$ 13		$ 20
PFOA Matters: Multi-District Litigation [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnification assets	$ 320		$ 320		$ 335
Loss Contingency, Loss in Period			335
Loss Contingency, Loss in Period, after tax			214
Discontinued Operations [Member] | PFOA Matters: Multi-District Litigation [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Tax Expense (Benefit)	(10)
Loss Contingency, Loss in Period			335
Loss Contingency, Loss in Period, after tax			214
Accounts and Notes Receivable [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnification assets	412		412
Other Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnification assets	$ 343		343
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]
Ownership interest in an entity				100.00%
Gain on sale of entity				$ 369
Gain on sale of entity, after-tax				$ 214