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Commitments and Contingent Liabilities Environmental (Details) $ in Millions | Sep. 30, 2019 USD ($)
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Loss Contingencies [Line Items] |  |
Accrual for Environmental Loss Contingencies | $ 349 | [1]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual | 720 |
Indemnification Assets | 204 |
Superfund Sites [Member] |  |
Loss Contingencies [Line Items] |  |
Accrual for Environmental Loss Contingencies | 51 |
Chemours [Member] | Indemnification Agreement [Member] | Superfund Sites [Member] |  |
Loss Contingencies [Line Items] |  |
Indemnification Assets | 30 |
Chemours related obligation subject to indemnification [Member] |  |
Loss Contingencies [Line Items] |  |
Accrual for Environmental Loss Contingencies | 170 | [2],[3]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual | 383 |
Indemnification Assets | 170 |
Discontinued Operations [Member] |  |
Loss Contingencies [Line Items] |  |
Accrual for Environmental Loss Contingencies | 102 | [1],[2]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual | 224 |
Indemnification Assets | 0 |
Environmental remediation liabilities primarily related to DuPont - subject to indemnity from DuPont [Member] |  |
Loss Contingencies [Line Items] |  |
Accrual for Environmental Loss Contingencies | 34 | [1]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual | 61 |
Indemnification Assets | 34 |
Not subject to indemnification [Member] |  |
Loss Contingencies [Line Items] |  |
Accrual for Environmental Loss Contingencies | 43 | [1]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual | 52 |
Indemnification Assets | 0 |
DuPont de Nemours [Member] | DuPont de Nemours [Member] |  |
Loss Contingencies [Line Items] |  |
Stray liability threshold | $ 200 |
[1] | Accrual balance represents management’s best estimate of the costs of remediation and restoration, although it is reasonably possible that the potential exposure, as indicated, could range above the amounts accrued, as there are inherent uncertainties in these estimates.
[2] | Represents liabilities that are subject the $200 million thresholds and sharing arrangements as discussed on page 41, under Corteva Separation Agreement.
[3] | The company has recorded an indemnification asset related to these accruals, including $30 million related to the Superfund sites.

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