RESTRUCTURING AND ASSET RELATED CHARGES - NET (DowDuPont Cost Synergy Program) (Details) - USD ($) $ in Millions	3 Months Ended		19 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions	$ 232	$ 165
DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	325		$ 325	$ 327
Restructuring, Settlement and Impairment Provisions	224	163	1,462
Restructuring Reserve, Settled without Cash	(100)
Payments for Restructuring	(126)
Employee Severance [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	237		237	262
Restructuring, Settlement and Impairment Provisions	72	104	633
Restructuring Reserve, Settled without Cash	0
Payments for Restructuring	(97)
Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0		0	0
Restructuring, Settlement and Impairment Provisions	100	48	613
Restructuring Reserve, Settled without Cash	(100)
Payments for Restructuring	0
Asset write-downs and write-offs [Member] | DowDuPont Cost Synergy Program [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, Settlement and Impairment Provisions	100
Costs Associated with Exit and Disposal Activities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	88		88	65
Restructuring, Settlement and Impairment Provisions	52	$ 11	216
Restructuring Reserve, Settled without Cash	0
Payments for Restructuring	(29)
Accrued and Other Current Liabilities [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	250		250	272
Other Noncurrent Obligations [Member] | DowDuPont Cost Synergy Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 75		$ 75	$ 55