INVESTMENTS IN RELATED COMPANIES (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Schedule of Cost-method Investments [Line Items]
Investments in related companies	$ 639	$ 639
Dow International Holdings Company [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments	$ 633	$ 633
Ownership Interest Percentage, Related Company	12.00%	15.00%
Dow Quimica Argentina S.A. [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments	$ 0	$ 0
Ownership Interest Percentage, Related Company	0.00%	23.00%
Dow Quimica Mexicana S.A. de C.V. [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments	$ 5	$ 5
Ownership Interest Percentage, Related Company	15.00%	15.00%
Other Investments [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments	$ 1	$ 1
Ownership Interest Percentage, Related Company	0.00%	0.00%