Restructuring and Asset Related Charges DowDuPont Cost Synergy Program (Details) - USD ($) $ in Millions	3 Months Ended	4 Months Ended	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2018	Nov. 01, 2017
DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			$ 161
Restructuring Reserve, Ending Balance	$ 259	$ 161	259
Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			133
Restructuring Reserve, Ending Balance	226	133	226
Contract Termination Charges | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Beginning Balance			28
Restructuring Reserve, Ending Balance	33	28	33
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	91		188
Successor [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	94	187	191
Payments for Restructuring			(85)
Restructuring Reserve, Net Translation Adjustment			(2)
Asset write-offs and adjustments			(6)
Successor [Member] | Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	84	153	152
Payments for Restructuring			(57)
Restructuring Reserve, Net Translation Adjustment			(2)
Successor [Member] | Contract Termination Charges | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	4	31	33
Payments for Restructuring			(28)
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	$ 6	$ 3	6
Asset write-offs and adjustments			$ (6)