Divestitures and Other Transactions Separation Agreements (Details) $ in Millions	Sep. 30, 2020 USD ($)
Accounts and Notes Receivable [Member] | DuPont de Nemours [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnification Assets	$ 22
Accounts and Notes Receivable [Member] | Dow [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnification Assets	15
Other Assets [Member] | DuPont de Nemours [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnification Assets	50
Accrued and Other Current Liabilities [Member] | DuPont de Nemours [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnified Liabilities	8
Accrued and Other Current Liabilities [Member] | Dow [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnified Liabilities	102
Other noncurrent obligations | DuPont de Nemours [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnified Liabilities	71
Other noncurrent obligations | Dow [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnified Liabilities	$ 13