Restructuring and Asset Related Charges DowDuPont Agriculture Division Restructuring Program (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended										4 Months Ended	12 Months Ended
	Sep. 30, 2017	[1]	Dec. 31, 2018		Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2017	[1]	Dec. 31, 2017	Dec. 31, 2018
DowDuPont Agriculture Division Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve			$ 54											$ 54
Successor [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	$ 40		115	[1]	$ 182		$ 91		$ 97		$ 140		$ 180	485
Successor [Member] | DowDuPont Agriculture Division Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			65											65
Restructuring and Asset Related Charges - Net														59
Successor [Member] | Asset Related Charges [Member] | DowDuPont Agriculture Division Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			5											5
Restructuring and Asset Related Charges - Net														5
Successor [Member] | Costs Related To Contract Termination [Member] | DowDuPont Agriculture Division Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			5											5
Successor [Member] | Employee Severance [Member] | DowDuPont Agriculture Division Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			$ 55											55
Restructuring and Asset Related Charges - Net														$ 54

[1] See Note 6 for additional information.