Commitments and Contingent Liabilities DuPont (Details)	Sep. 30, 2020 USD ($)
PFAS [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Corteva and DuPont stray liability threshold for PFAS	$ 1
PFAS [Member] | Minimum [Member] | Once $300 million threshold is met [Member]
Loss Contingencies [Line Items]
De minimis threshold	1,000,000
PFAS [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Corteva and DuPont stray liability threshold for PFAS	300,000,000
DuPont de Nemours [Member]
Loss Contingencies [Line Items]
Amount credited to each company's threshold	$ 150,000,000
Corteva [Member]
Loss Contingencies [Line Items]
Stray liability sharing percentage	29.00%
Corteva [Member] | PFAS [Member]
Loss Contingencies [Line Items]
Stray liability sharing percentage for PFAS	50.00%
Corteva [Member] | DuPont de Nemours [Member]
Loss Contingencies [Line Items]
Stray liability threshold	$ 200,000,000
DuPont de Nemours [Member]
Loss Contingencies [Line Items]
Stray liability sharing percentage	71.00%
DuPont de Nemours [Member] | PFAS [Member]
Loss Contingencies [Line Items]
Stray liability sharing percentage for PFAS	50.00%
DuPont de Nemours [Member] | DuPont de Nemours [Member]
Loss Contingencies [Line Items]
Stray liability threshold	$ 200,000,000
Corteva and DuPont stray liability threshold for PFAS	$ 200,000,000