STOCKHOLDERS' EQUITY (Retained Earnings) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dividends declared (in dollars per share)	$ 0.70	$ 0.70	$ 0.70	$ 2.10	$ 0	$ 1.38
Undistributed Earnings of Nonconsolidated Affiliates	$ 852			$ 852	$ 1,856
The Dow Chemical Company
Dividends declared (in dollars per share)						$ 1.38
Dow Inc. [Member]
Dividends declared (in dollars per share)				$ 2.10