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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Feb. 15, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]        
Payments of Dividends $ 160 $ 111    
The Dow Chemical Company [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party $ 334 433    
Service Fee with Parent 10.00%      
Notes Receivable, Related Parties $ 1,400     $ 1,300
Line of Credit Facility, Maximum Borrowing Capacity 1,000      
Line of Credit Facility, Remaining Borrowing Capacity 949     $ 949
Payments of Dividends 160 111    
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    
The Dow Chemical Company [Member] | Cost of Sales [Member]        
Related Party Transaction [Line Items]        
Related Party Transaction, Expenses from Transactions with Related Party $ 23 $ 22    
Dow International Holdings Company [Member]        
Related Party Transaction [Line Items]        
Stock Dividend Ownership Interest Percentage, Related Company     63.40%  
Ownership Interest Percentage, Related Company 4.40%   11.90%  
The Dow Chemical Company [Member] | Dow International Holdings Company [Member]        
Related Party Transaction [Line Items]        
Ownership Interest Percentage, Related Company     88.10%  
Dividends, Common Stock, Stock $ 401