EARNINGS PER SHARE CALCULATIONS (Net Income) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016		Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net Income Attributable to The Dow Chemical Company		$ 783	$ 804		$ 2,992	$ 4,266
Preferred Stock, Dividends Per Share, Declared		$ 0	$ 0.07	[1]	$ 0	$ 0.23	[1]
Net income attributable to participating securities	[2]	$ (6)	$ (18)		$ (10)	$ (19)
Net income attributable to common stockholders		777	701		2,982	3,992
Preferred stock dividends	[1]	0	(85)		0	(255)
Net income attributable to participating securities, Diluted	[2]	(6)	(18)		(10)	(19)
Net income attributable to common stockholders, Diluted		$ 777	$ 786		$ 2,982	$ 4,247

[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.