Restructuring and Asset Related Charges DowDuPont Agriculture Division Restructuring Program (Details) - DowDuPont Agriculture Division Restructuring Program [Member] - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	$ (14,000,000)	$ 84,000,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	(17,000,000)	78,000,000
Asset Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	3,000,000	6,000,000
Seed [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	3,000,000	5,000,000
Crop Protection [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	(4,000,000)	1,000,000
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	$ (13,000,000)	$ 78,000,000