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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Feb. 15, 2019
Related Party Transaction [Line Items]              
Payments of Dividends       $ 187 $ 338    
The Dow Chemical Company [Member]              
Related Party Transaction [Line Items]              
Related Party Transaction, Expenses from Transactions with Related Party $ 270 $ 247   $ 707 861    
Service Fee with Parent       10.00%      
Notes Receivable, Related Parties 1,500     $ 1,500   $ 1,500  
Line of Credit Facility, Maximum Borrowing Capacity 1,000     1,000      
Line of Credit Facility, Remaining Borrowing Capacity 937     937   $ 937  
Payments of Dividends 25 112   187 338    
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 7 6   23 18    
The Dow Chemical Company [Member] | Cost of Sales [Member]              
Related Party Transaction [Line Items]              
Related Party Transaction, Expenses from Transactions with Related Party $ 19 $ 21   $ 66 $ 65    
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