RESTRUCTURING AND ASSET RELATED CHARGES - NET (DowDuPont Cost Synergy Program) (Details) - USD ($) $ in Millions	3 Months Ended							9 Months Ended		25 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	$ 147				$ 48			$ 368	$ 175
DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	127	$ 159	$ 202	$ 217	250	$ 263	$ 306	127	250	$ 127	$ 275
Restructuring and asset related charges - net	56	59	144	22	47	30	85			842
Restructuring Reserve, Settled without Cash	(5)	(31)	(76)	(13)	(4)	(13)	(3)
Payments for Restructuring	(83)	(71)	(83)	(42)	(56)	(60)	(51)
Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	106	137	183	210	240	253	290	106	240	106	270
Restructuring and asset related charges - net	46	25	52	9	43	17	68			567
Restructuring Reserve, Settled without Cash	0	0	0	0	0	0	0
Payments for Restructuring	(77)	(71)	(79)	(39)	(56)	(54)	(48)
Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0	0	0	0	0	0	0	0	0	0
Restructuring and asset related charges - net	5	29	76	13	4	13	3			230
Restructuring Reserve, Settled without Cash	(5)	(29)	(76)	(13)	(4)	(13)	(3)
Payments for Restructuring	0	0	0	0	0	0	0
Costs Associated with Exit and Disposal Activities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	21	22	19	7	10	10	16	21	$ 10	21	$ 5
Restructuring and asset related charges - net	5	5	16	0	0	0	14			45
Restructuring Reserve, Settled without Cash	0	(2)	0	0	0	0	0
Payments for Restructuring	(6)	0	(4)	(3)	0	(6)	(3)
Packaging & Specialty Plastics [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net			1	6	4		3
Packaging & Specialty Plastics [Member] | Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net			0	0	0		0
Packaging & Specialty Plastics [Member] | Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net			0	6	4		0
Packaging & Specialty Plastics [Member] | Costs Associated with Exit and Disposal Activities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net			1	0	0		3
Industrial Intermediates & Infrastructure [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	5						11
Industrial Intermediates & Infrastructure [Member] | Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	0						0
Industrial Intermediates & Infrastructure [Member] | Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	0						0
Industrial Intermediates & Infrastructure [Member] | Costs Associated with Exit and Disposal Activities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	5						11
Performance Materials & Coatings [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	1	22		7
Performance Materials & Coatings [Member] | Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net		0		0
Performance Materials & Coatings [Member] | Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	1	22		7
Performance Materials & Coatings [Member] | Costs Associated with Exit and Disposal Activities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net		0		0
Corporate Segment [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	50	37	143	9	43	30	71
Corporate Segment [Member] | Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	46	25	52	9	43	17	68
Corporate Segment [Member] | Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	4	7	76	0	0	13	3
Corporate Segment [Member] | Costs Associated with Exit and Disposal Activities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	0	$ 5	$ 15	0	$ 0	$ 0	$ 0
Accrued and Other Current Liabilities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	107			205				107		107
Other Noncurrent Liabilities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 20			$ 12				$ 20		$ 20