EARNINGS PER SHARE CALCULATIONS (Net Income) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net Income Attributable to The Dow Chemical Company		$ 1,321	$ 3,208	$ 2,209	$ 3,462
Preferred Stock, Dividends Per Share, Declared	[1]	$ 0.00	$ 0.07	$ 0.00	$ 0.15
Net income attributable to participating securities	[2]	$ (6)	$ (18)	$ (10)	$ (19)
Net income attributable to common stockholders		1,315	3,105	2,199	3,273
Preferred stock dividends	[1]	0	(85)	0	(170)
Net income attributable to participating securities, Diluted	[2]	(6)	(18)	(10)	(19)
Net income attributable to common stockholders, Diluted		$ 1,315	$ 3,190	$ 2,199	$ 3,443

[1] On December 30, 2016, the Company converted its outstanding shares of Cumulative Convertible Perpetual Preferred Stock, Series A ("Preferred Stock") into shares of the Company's common stock. As a result of this conversion, no shares of Preferred Stock are issued or outstanding.

[2] Deferred stock awards are considered participating securities due to Dow's practice of paying dividend equivalents on unvested shares.