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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Feb. 15, 2019
Related Party Transaction [Line Items]        
Payments of Dividends $ 81 $ 160    
The Dow Chemical Company [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party $ 231 334    
Service Fee with Parent 10.00%      
Notes Receivable, Related Parties $ 1,500   $ 1,500  
Line of Credit Facility, Maximum Borrowing Capacity 1,000      
Line of Credit Facility, Remaining Borrowing Capacity 936   $ 937  
Payments of Dividends 81 160    
Dividends, Paid-in-kind   71    
The Dow Chemical Company [Member] | Sundry income (expense) [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party 8 6    
The Dow Chemical Company [Member] | Cost of Sales [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party $ 23 23    
Dow International Holdings Company [Member]        
Related Party Transaction [Line Items]        
Stock Dividend Ownership Interest Percentage, Related Company       63.40%
The Dow Chemical Company [Member] | Dow International Holdings Company [Member]        
Related Party Transaction [Line Items]        
Dividends, Common Stock, Stock   $ 401