STOCKHOLDERS' EQUITY (Treasury Stock) (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended			56 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 30, 2017
Equity, Class of Treasury Stock [Line Items]
Share buy-back program authorized amount	$ 9,500
Payments for the repurchase of common stock	$ 0	$ 916	$ 1,166	$ 8,100
The Dow Chemical Company 2012 Stock Incentive Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury stock issued under stock-based compensation programs	14,195	14,494	16,490