RESTRUCTURING, GOODWILL IMPAIRMENT AND ASSET RELATED CHARGES - NET (DowDuPont Cost Synergy Program) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 01, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net	$ 2,851	$ 147	$ 65	$ 156	$ 46	$ 48	$ 40	$ 87	$ 3,219	$ 221	$ 2,739
Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									1,076	21	1,578
Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									1,175	11	17
Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									439	46	716
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									529	143	428
DowDuPont Cost Synergy Program
Restructuring Cost and Reserve [Line Items]
Expected cost												$ 1,300
Restructuring, goodwill impairment and asset related charges - net									292	184	399
Charges against the reserve									(143)	(33)	(87)
Cash payments									(295)	(209)	(37)
Restructuring Reserve	71				217				71	217	275
DowDuPont Cost Synergy Program | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									28	7	11
DowDuPont Cost Synergy Program | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									7	11	12
DowDuPont Cost Synergy Program | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									1	13	36
DowDuPont Cost Synergy Program | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									256	153	340
DowDuPont Cost Synergy Program | Accrued and other current liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	52				205				52	205
DowDuPont Cost Synergy Program | Other noncurrent obligations
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	19				12				19	12
DowDuPont Cost Synergy Program | Property, Plant and Equipment
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net											87
DowDuPont Cost Synergy Program | Severance and Related Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									123	137	307
Charges against the reserve									0	0	0
Cash payments									(279)	(197)	(37)
Restructuring Reserve	54				210				54	210	270
DowDuPont Cost Synergy Program | Severance and Related Benefit Costs | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									0	0	0
DowDuPont Cost Synergy Program | Severance and Related Benefit Costs | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									0	0	0
DowDuPont Cost Synergy Program | Severance and Related Benefit Costs | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									0	0	0
DowDuPont Cost Synergy Program | Severance and Related Benefit Costs | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									123	137	307
DowDuPont Cost Synergy Program | Severance and Related Benefit Costs | Minimum
Restructuring Cost and Reserve [Line Items]
Expected cost												525
DowDuPont Cost Synergy Program | Severance and Related Benefit Costs | Maximum
Restructuring Cost and Reserve [Line Items]
Expected cost												575
DowDuPont Cost Synergy Program | Asset Write-downs and Write-offs
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									143	33	87
Charges against the reserve									(143)	(33)	(87)
Cash payments									0	0	0
Restructuring Reserve	0				0				0	0	0
DowDuPont Cost Synergy Program | Asset Write-downs and Write-offs | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									28	7	9
DowDuPont Cost Synergy Program | Asset Write-downs and Write-offs | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									2	0	12
DowDuPont Cost Synergy Program | Asset Write-downs and Write-offs | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									0	10	33
DowDuPont Cost Synergy Program | Asset Write-downs and Write-offs | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									113	16	33
DowDuPont Cost Synergy Program | Asset Write-downs and Write-offs | Minimum
Restructuring Cost and Reserve [Line Items]
Expected cost												400
DowDuPont Cost Synergy Program | Asset Write-downs and Write-offs | Maximum
Restructuring Cost and Reserve [Line Items]
Expected cost												440
DowDuPont Cost Synergy Program | Costs Associated with Exit and Disposal Activities
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									26	14	5
Charges against the reserve									0	0	0
Cash payments									(16)	(12)	0
Restructuring Reserve	$ 17				$ 7				17	7	5
DowDuPont Cost Synergy Program | Costs Associated with Exit and Disposal Activities | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									0	0	2
DowDuPont Cost Synergy Program | Costs Associated with Exit and Disposal Activities | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									5	11	0
DowDuPont Cost Synergy Program | Costs Associated with Exit and Disposal Activities | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									1	3	3
DowDuPont Cost Synergy Program | Costs Associated with Exit and Disposal Activities | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net									$ 20	0	0
DowDuPont Cost Synergy Program | Costs Associated with Exit and Disposal Activities | Minimum
Restructuring Cost and Reserve [Line Items]
Expected cost												290
DowDuPont Cost Synergy Program | Costs Associated with Exit and Disposal Activities | Maximum
Restructuring Cost and Reserve [Line Items]
Expected cost												$ 310
DowDuPont Cost Synergy Program | Asset Related Charges and Other, Write-off of Capital Projects and Other Non-manufacturing Assets [Member] | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net											22
DowDuPont Cost Synergy Program | Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net										33	65
DowDuPont Cost Synergy Program | Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs | Performance Materials & Coatings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net										7	9
DowDuPont Cost Synergy Program | Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs | Industrial Intermediates & Infrastructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net											12
DowDuPont Cost Synergy Program | Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs | Packaging & Specialty Plastics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net										10	11
DowDuPont Cost Synergy Program | Asset Related Charges and Other, Miscellaneous Asset Write-Down and Write-Offs | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, goodwill impairment and asset related charges - net										$ 16	$ 33