Commitments and Contingent Liabilities Environmental (Details) $ in Millions	Sep. 30, 2020 USD ($)
Loss Contingencies [Line Items]
Indemnification Asset	$ 192
Accrual for Environmental Loss Contingencies	342	[1]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	610	[1]
Chemours related obligation subject to indemnification [Member]
Loss Contingencies [Line Items]
Indemnification Asset	158	[2],[3]
Accrual for Environmental Loss Contingencies	158	[1],[2],[3]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	284	[1],[2],[3]
Discontinued Operations [Member]
Loss Contingencies [Line Items]
Indemnification Asset		[2]
Other discontinued or divested business obligations [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	83	[1],[2]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	219	[1],[2]
Environmental remediation liabilities primarily related to DuPont - subject to indemnity from DuPont [Member]
Loss Contingencies [Line Items]
Indemnification Asset	34	[3]
Accrual for Environmental Loss Contingencies	34	[1],[3]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	62	[1],[3]
Not subject to indemnification [Member]
Loss Contingencies [Line Items]
Indemnification Asset
Accrual for Environmental Loss Contingencies	67	[1]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	45	[1]
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
Superfund Sites [Member] | Chemours [Member] | Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Indemnification Asset	$ 30

[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 28, under Corteva Separation Agreement.

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