Restructuring and Asset Related Charges DowDuPont Cost Synergy Program (Details) - Successor [Member] - 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		Dec. 31, 2017	Dec. 31, 2018	Nov. 01, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	$ 40		$ 115	[1]	$ 182		$ 91		$ 97		$ 140	[1]	$ 180	$ 485
DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net													187	322
Payments for Restructuring														(168)
Asset write-offs														(63)
Restructuring Reserve, Net Translation Adjustment														(5)
Restructuring Reserve			247								161		161	247
Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net													153	219
Payments for Restructuring														(118)
Asset write-offs														0
Restructuring Reserve, Net Translation Adjustment														(5)
Restructuring Reserve			229								133		133	229
Costs Related To Contract Termination [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net													31	40
Payments for Restructuring														(50)
Asset write-offs														0
Restructuring Reserve, Net Translation Adjustment														0
Restructuring Reserve			18								28		28	18
Asset Related Charges [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net													3	63
Payments for Restructuring														0
Asset write-offs														(63)
Restructuring Reserve, Net Translation Adjustment														0
Restructuring Reserve			$ 0								$ 0		$ 0	0
Minimum [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost															$ 575
Minimum [Member] | Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost															370
Minimum [Member] | Costs Related To Contract Termination [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost															80
Minimum [Member] | Asset Related Charges [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost															125
Maximum [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost															675
Maximum [Member] | Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost															400
Maximum [Member] | Costs Related To Contract Termination [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost															100
Maximum [Member] | Asset Related Charges [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost															$ 175
Restructuring and Asset Related Charges - Net [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net														318
Nonoperating Income (Expense) [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net														$ 4

[1] See Note 6 for additional information.