STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY (Shares of Dow Common Stock) (Details) - shares shares in Millions			8 Months Ended	12 Months Ended
	Dec. 30, 2016	Oct. 05, 2015	Aug. 30, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 31, 2017	Dec. 31, 2014
Common Stock [Member]
Schedule of Common Stock and Treasury Stock Outstanding Roll Forward [Line Items]
Stock Issued During Period, Shares, Treasury Stock Reissued	(96.8)
Dow [Member] | Common Stock [Member]
Schedule of Common Stock and Treasury Stock Outstanding Roll Forward [Line Items]
Shares, Outstanding				1,242,795.0	1,242,795.0	0.0	1,242,763.0
Stock Issued During Period, Shares, New Issues			0.0	0.0	32.0
Stock Issued During Period, Shares, Conversion of Convertible Securities			(1,242,795.0)	0.0
Dow [Member] | Treasury Stock [Member]
Schedule of Common Stock and Treasury Stock Outstanding Roll Forward [Line Items]
Shares, Outstanding				31,662.0	125,853.0	0.0	85,169.0
Stock Issued During Period, Shares, Treasury Stock Reissued			(14,195.0)	(14,494.0)	(16,490.0)
Treasury Stock, Shares, Acquired				17,107.0	57,174.0
Stock Issued During Period, Shares, Conversion of Convertible Securities			(17,467.0)	(96,804.0)
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations [Member] | Chlorine Value Chain [Member] | Common Stock [Member]
Schedule of Common Stock and Treasury Stock Outstanding Roll Forward [Line Items]
Dow Shares Exchange in Share Exchange Offer		34.1