Commitments and Contingent Liabilities Environmental (Details) - USD ($) $ in Millions		Dec. 31, 2020		Dec. 31, 2019
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies		$ 329	[1],[2]	$ 336
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	[2]	620
Indemnification Asset		190
Performance Chemicals [Member]
Loss Contingencies [Line Items]
Indemnified Liabilities for Liabilities Indemnified by Chemours		39
Chemours related obligation subject to indemnification [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	[1],[2],[3],[4]	154
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	[2],[3],[4]	282
Indemnification Asset	[3],[4]	153
Discontinued Operations [Member]
Loss Contingencies [Line Items]
Indemnification Asset	[3]	0
Environmental remediation liabilities primarily related to DuPont - subject to indemnity from DuPont [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	[1],[2],[4]	36
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	[2],[4]	61
Indemnification Asset	[4]	37
Not subject to indemnification [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	[1],[2]	65
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	[2]	55
Indemnification Asset		0
Other Discontinued or Divested Business Obligations
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	[1],[2],[3]	74
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	[2],[3]	222
DuPont de Nemours [Member] | DuPont de Nemours [Member]
Loss Contingencies [Line Items]
Stray liability threshold		200
Superfund Sites [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies		52		$ 51
Superfund Sites [Member] | Chemours [Member] | Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Indemnification Asset		$ 30

[1] Accrual balance excludes indemnification liabilities of $39 million to Chemours, related to the cost sharing arrangement under the MOU (see page F-27).

[2] 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.

[3] Represents liabilities that are subject the $200 million thresholds and sharing arrangements as discussed on page F-51, under Corteva Separation Agreement.

[4] The company has recorded an indemnification asset related to these accruals, including $30 million related to the Superfund sites.