STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY - Common Stock (Details) - $ / shares	9 Months Ended
	Sep. 30, 2019	Apr. 01, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Common stock, authorized (in shares)	5,000,000,000		100
Common Stock, Shares, Issued	749,457,637		100
Dow Inc. [Member]
Class of Stock [Line Items]
Stock Repurchased During Period, Shares	7,961,732
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock, authorized (in shares)		5,000,000,000	100
Common Stock, Shares, Issued	749,457,637	748,771,240	100
Treasury Stock, Common, Shares	7,961,732		0
Conversion of Stock, Shares Issued	748,771,140
Stock Issued During Period, Shares, New Issues	686,397
The Dow Chemical Company [Domain]
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, authorized (in shares)	100	100	100
Common Stock, Shares, Issued	100		100