Commitments and Contingent Liabilities Environmental (Details) - USD ($) $ in Millions		Dec. 31, 2019		Dec. 31, 2018
Loss Contingencies [Line Items]
Indemnification Assets		$ 202
Accrual for Environmental Loss Contingencies		336	[1]	$ 398
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	[1]	620
Superfund Sites [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies		51		$ 54
Indemnification Agreement [Member] | Chemours [Member] | Superfund Sites [Member]
Loss Contingencies [Line Items]
Indemnification Assets		30
Chemours related obligation subject to indemnification [Member]
Loss Contingencies [Line Items]
Indemnification Assets		167
Accrual for Environmental Loss Contingencies	[1],[2],[3]	167
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	[1]	285
Discontinued Operations [Member]
Loss Contingencies [Line Items]
Indemnification Assets		0
Accrual for Environmental Loss Contingencies	[1],[2]	91
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	[1]	221
Environmental remediation liabilities primarily related to DuPont - subject to indemnity from DuPont [Member]
Loss Contingencies [Line Items]
Indemnification Assets		35
Accrual for Environmental Loss Contingencies	[1],[3]	35
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	[1]	60
Not subject to indemnification [Member]
Loss Contingencies [Line Items]
Indemnification Assets		0
Accrual for Environmental Loss Contingencies	[1]	43
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	[1]	54
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 F-61, under Corteva Separation Agreement.

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