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Divestitures and Other Transactions Divestitures and Other Transactions - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Goodwill Impairment Charge |  | $ 0 | $ 0 | $ 4,503
Equity Method Investment, Other than Temporary Impairment | $ 41 |  |  |
Income (loss) from discontinued operations after income taxes |  | (55) | (671) | 1,748
Specialty Products Disposal [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Goodwill Impairment Charge |  |  | 1,102 | 0
Equity Method Investment, Other than Temporary Impairment |  |  | 63 |
Income (loss) from discontinued operations after income taxes |  |  | (859) | 1,602
Divested Ag Business [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from discontinued operations after income taxes |  |  | 80 | $ (5)
Other discontinued operations [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from discontinued operations after income taxes |  | 10 | $ 89 |
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 |  | 27 |  |
Accounts and Notes Receivable [Member] | Dow [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Indemnification Assets |  | 5 |  |
Other Assets [Member] | DuPont de Nemours [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Indemnification Assets |  | 51 |  |
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 |  | 5 |  |
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 |  | 87 |  |
Other Noncurrent Obligations [Member] | DuPont de Nemours [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Indemnified Liabilities |  | 79 |  |
Other Noncurrent Obligations [Member] | Dow [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Indemnified Liabilities |  | $ 13 |  |

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