Commitments and Contingent Liabilities Environmental (Details) $ in Millions	Jun. 30, 2019 USD ($)
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	$ 357
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	725
Indemnification Assets	200
Superfund Sites [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	49
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	169	[1],[2]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	380
Indemnification Assets	169
Discontinued Operations [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	100	[1]
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	228
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	31
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	63
Indemnification Assets	31
Not subject to indemnification [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	57
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	54
Indemnification Assets	0
DuPont de Nemours [Member] | DuPont de Nemours [Member]
Loss Contingencies [Line Items]
Stray liability threshold	$ 200

[1] Represents liabilities that are subject the $200 million thresholds and sharing arrangements as discussed on page 38, under Corteva Separation Agreement.

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