RESTRUCTURING, GOODWILL IMPAIRMENT AND ASSET RELATED CHARGES - NET (DowDuPont Cost Synergy Program) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 01, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net	$ 249	$ 108	$ 98	$ 165	$ 2,974	$ 139	$ (12)	$ (1)	$ 620	$ 3,100	$ 595
DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Expected cost												$ 1,300
Restructuring, goodwill impairment and asset related charges - net									551	687
Restructuring Reserve	327				349				327	349
Charges against the reserve									(226)	(287)
Cash payments									(347)	(51)
Severance and Related Benefit Costs | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									204	357
Restructuring Reserve	262				306				262	306
Charges against the reserve									0	0
Cash payments									(248)	(51)
Asset Write-downs and Write-offs | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									226	287
Restructuring Reserve	0				0				0	0
Charges against the reserve									(226)	(287)
Cash payments									0	0
Costs Associated with Exit and Disposal Activities | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									121	43
Restructuring Reserve	65				43				65	43
Charges against the reserve									0	0
Cash payments									(99)	0
Asset Related Charges and Other, Facility Closing and Write-down of Non-manufacturing Assets | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									171	94
Asset Related Charges and Other, Facility Closing and write-down of IPR&D | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net										83
Asset Related Charges and Other, Write-off of Capital Projects and Other Non-manufacturing Assets | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net										22
Asset Related Charges and Other, Facility Closing | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net										21
Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									28	67
Asset Related Charges and Other - Facility Closings [Member] | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									27
Minimum | Severance and Related Benefit Costs | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Expected cost												525
Minimum | Asset Write-downs and Write-offs | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Asset related expected costs												400
Minimum | Costs Associated with Exit and Disposal Activities | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Expected cost												290
Maximum | Severance and Related Benefit Costs | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Expected cost												575
Maximum | Asset Write-downs and Write-offs | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Asset related expected costs												440
Maximum | Costs Associated with Exit and Disposal Activities | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Expected cost												$ 310
Accrued and other current liabilities | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	272				231				272	231
Other noncurrent obligations | DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 55				$ 118				$ 55	$ 118