NOTES PAYABLE, LONG-TERM DEBT AND AVAILABLE CREDIT FACILITIES (Debt Covenants) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Apr. 01, 2019 USD ($)
The Dow Chemical Company
Debt Instrument [Line Items]
Amount at which a failure to pay results in repayment acceleration	$ 100
Amount of principal to be accelerated upon default	400
Amount of judgment which will cause a default	$ 400
The Dow Chemical Company | Revolving Credit Facility | Five Year Competitive Advance and Revolving Credit Facility
Debt Instrument [Line Items]
Ratio of total indebtedness to total capitalization	0.65
Aggregate amount outstanding to trigger indebtedness to total capitalization covenant	$ 500
Dow Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Debt Default, Default Trigger, Amount Guaranteed for Third Party Indebtedness for Borrowed Money		$ 250