RESTRUCTURING AND ASSET RELATED CHARGES - NET (DowDuPont Cost Synergy Program) (Details) - USD ($) $ in Millions	3 Months Ended						6 Months Ended		22 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	$ 65				$ 40		$ 221	$ 127
DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	159	$ 202	$ 217	$ 250	263	$ 306	159	263	$ 159	$ 275
Restructuring and asset related charges - net	59	144	22	47	30	85			786
Restructuring Reserve, Settled without Cash	(31)	(76)	(13)	(4)	(13)	(3)
Payments for Restructuring	(71)	(83)	(42)	(56)	(60)	(51)
Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	137	183	210	240	253	290	137	253	137	270
Restructuring and asset related charges - net	25	52	9	43	17	68			521
Restructuring Reserve, Settled without Cash	0	0	0	0	0	0
Payments for Restructuring	(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
Restructuring and asset related charges - net	29	76	13	4	13	3			225
Restructuring Reserve, Settled without Cash	(29)	(76)	(13)	(4)	(13)	(3)
Payments for Restructuring	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	22	19	7	10	10	16	22	$ 10	22	$ 5
Restructuring and asset related charges - net	5	16	0	0	0	14			40
Restructuring Reserve, Settled without Cash	(2)	0	0	0	0	0
Payments for Restructuring	0	(4)	(3)	0	(6)	(3)
Industrial Intermediates & Infrastructure [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net						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
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
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						11
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
Corporate Segment [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	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	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	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	5	$ 15	0	$ 0	$ 0	$ 0
Performance Materials & Coatings [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and asset related charges - net	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	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
Accrued and Other Current Liabilities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	139		205				139		139
Other Noncurrent Liabilities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 20		$ 12				$ 20		$ 20