SUPPLEMENTARY INFORMATION (Sundry Income, Net) (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2013	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Supplementary Information [Line Items]
Total sundry income (expense) - net				$ (30)		$ 14		$ 308
Nonmonetary Transaction, Gain (Loss) Recognized on Transfer				23		0		0
Reclassification of cumulative translation adjustment				0		(16)		0
Net gain on sales of property				(3)		4		0
Impairment of investment in related company				0		0		(25)	[1]
Foreign exchange loss				(2)		0		(2)
Other - net				(6)		(9)		(7)
Administrative and overhead fees [Member] | The Dow Chemical Company [Member]
Supplementary Information [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	[1]			(30)		(26)		(25)
Net Commission Expense [Member]
Supplementary Information [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	[1]			(22)		(21)		(17)
Dividend Income [Member]
Supplementary Information [Line Items]
Dividend income - related company	[1]			0		12		16
Methylmercapto Propionaldehyde Assets [Member]
Supplementary Information [Line Items]
Net gain on sale of Dow's Polypropylene Licensing and Catalysts business		$ 31
Polypropylene Licensing and Catalyst Business [Member]
Supplementary Information [Line Items]
Net gain on sale of Dow's Polypropylene Licensing and Catalysts business			$ 398	0	[2]	4	[2]	368	[2]
Property, Plant and Equipment [Member]
Supplementary Information [Line Items]
Net gain on sale of assets				0		66	[1]	0
Patents [Member]
Supplementary Information [Line Items]
Net gain on sale of assets						$ 0		$ 0
Patents [Member] | Methylmercapto Propionaldehyde Assets [Member]
Supplementary Information [Line Items]
Net gain on sale of assets	[2]			$ 10

[1] See Note 17 for additional information.

[2] See Note 4 for additional information.