Restructuring and Asset Related Charges DowDuPont Agriculture Division Restructuring Program (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		10 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net		$ 46	$ 235	$ 167	$ 466
DowDuPont Agriculture Division Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance				77
Restructuring and Asset Related Charges - Net				(1)		$ 83
Payments for Restructuring				(35)
Asset write-offs and adjustments				(3)
Separation Related Transaction Costs	[1]			(6)
Restructuring Reserve, Ending Balance		32		32		32
Employee Severance [Member] | DowDuPont Agriculture Division Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance				77
Restructuring and Asset Related Charges - Net				(4)		74
Payments for Restructuring				(35)
Asset write-offs and adjustments				0
Separation Related Transaction Costs	[1]			(6)
Restructuring Reserve, Ending Balance		32		32		32
Asset Related Charges [Member] | DowDuPont Agriculture Division Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance				0
Restructuring and Asset Related Charges - Net				3		9
Payments for Restructuring				0
Asset write-offs and adjustments				(3)
Separation Related Transaction Costs	[1]			0
Restructuring Reserve, Ending Balance		0		0		$ 0
Seed [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net		(47)	(190)	(123)	(273)
Seed [Member] | Asset Related Charges [Member] | DowDuPont Agriculture Division Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net				3
Crop Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net		$ 1	(30)	(24)	(42)
Crop Protection [Member] | Employee Severance [Member] | DowDuPont Agriculture Division Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net				(4)
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net			$ (15)	$ (20)	$ (151)

[1] Adjustment reflects severance liabilities associated with DAS employees who were terminated by Dow prior to separation and were included within the combined financial statements of Dow, but did not transfer to Corteva as part of the common control combination.