Restructuring and Asset Related Charges DowDuPont Cost Synergy Program (Details) - Successor [Member] - USD ($) $ in Millions		1 Months Ended		3 Months Ended		4 Months Ended
		Sep. 30, 2017	[1]	Dec. 31, 2017		Dec. 31, 2017	Nov. 01, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net		$ 40		$ 140	[1]	$ 180
DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net						187
Payments for Restructuring						(16)
Asset write-offs						(3)
Non-Cash Compensation						(7)
Restructuring Reserve				161		161
Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net						153
Payments for Restructuring						(13)
Asset write-offs						0
Non-Cash Compensation						(7)
Restructuring Reserve				133		133
Other Non-Personnel Charges | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net	[2]					31
Payments for Restructuring	[2]					(3)
Asset write-offs	[2]					0
Non-Cash Compensation	[2]					0
Restructuring Reserve	[2]			28		28
Asset Related Charges [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Asset Related Charges - Net						3
Payments for Restructuring						0
Asset write-offs						(3)
Non-Cash Compensation						0
Restructuring Reserve				$ 0		$ 0
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] | Other Non-Personnel 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] | Other Non-Personnel 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

[1] See Note 5 for additional information.

[2] Other non-personnel charges consist of contractual obligation costs.