STOCKHOLDERS' EQUITY (Merger with DuPont) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Aug. 31, 2017
Class of Stock [Line Items]
Merger impact	$ 0
Dow [Member]
Class of Stock [Line Items]
Dow to DowDuPont Share Exchange Ratio for Common Shares		1
Treasury Stock [Member]
Class of Stock [Line Items]
Merger impact	935
Common Stock [Member]
Class of Stock [Line Items]
Merger impact	3,107
Additional Paid-in Capital [Member]
Class of Stock [Line Items]
Merger impact	$ 2,172