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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Feb. 15, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]              
Payments of Dividends       $ 338 $ 246    
The Dow Chemical Company [Member]              
Related Party Transaction [Line Items]              
Related Party Transaction, Expenses from Transactions with Related Party $ 280   $ 379 $ 614 812    
Service Fee with Parent       10.00%      
Notes Receivable, Related Parties 1,400     $ 1,400     $ 1,300
Line of Credit Facility, Maximum Borrowing Capacity 1,000     1,000      
Line of Credit Facility, Remaining Borrowing Capacity 936     936     $ 949
Payments of Dividends 178   135 338 246    
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 6   7 12 14    
The Dow Chemical Company [Member] | Cost of Sales [Member]              
Related Party Transaction [Line Items]              
Related Party Transaction, Expenses from Transactions with Related Party $ 21   $ 22 $ 44 $ 44    
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