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Restructuring and Asset Related Charges DowDuPont Cost Synergy Program (Details) - USD ($) $ in Millions	3 Months Ended	4 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Nov. 01, 2017
DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance	$ 161
Restructuring Reserve, Ending Balance	212	$ 161
Employee Severance [Member] \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance	133
Restructuring Reserve, Ending Balance	171	133
Contract Termination Charges \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance	28
Restructuring Reserve, Ending Balance	41	28
Minimum [Member] \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			$ 430
Minimum [Member] \| Employee Severance [Member] \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			320
Minimum [Member] \| Contract Termination Charges \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			110
Maximum [Member] \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			600
Maximum [Member] \| Employee Severance [Member] \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			360
Maximum [Member] \| Contract Termination Charges \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			140
Maximum [Member] \| Asset Related Charges [Member] \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			$ 100
Successor [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	97
Successor [Member] \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	97	187
Payments for Restructuring	(47)
Restructuring Reserve, Net Translation Adjustment	1
Successor [Member] \| Employee Severance [Member] \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	68	153
Payments for Restructuring	(31)
Restructuring Reserve, Net Translation Adjustment	1
Successor [Member] \| Contract Termination Charges \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	29	31
Payments for Restructuring	(16)
Restructuring Reserve, Net Translation Adjustment	$ 0
Successor [Member] \| Asset Related Charges [Member] \| DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net		$ 3