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INVESTMENTS IN RELATED COMPANIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Feb. 15, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]        
Investments in related companies $ 238     $ 639
Dow International Holdings Company [Member]        
Schedule of Investments [Line Items]        
Ownership Interest Percentage, Related Company 5.00% 4.70% 11.90% 12.00%
Cost Method Investments $ 232     $ 633
Stock Dividend Ownership Interest Percentage, Related Company     63.40%  
Dow Quimica Mexicana S.A. de C.V. [Member]        
Schedule of Investments [Line Items]        
Ownership Interest Percentage, Related Company 15.00%     15.00%
Cost Method Investments $ 5     $ 5
Other [Member]        
Schedule of Investments [Line Items]        
Ownership Interest Percentage, Related Company 0.00%     0.00%
Cost Method Investments $ 1     $ 1
The Dow Chemical Company [Member] | Dow International Holdings Company [Member]        
Schedule of Investments [Line Items]        
Ownership Interest Percentage, Related Company     88.10%  
Dividends, Common Stock, Stock $ 401