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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 18, 2015
Related Party Transaction [Line Items]            
Payments of Dividends       $ 455 $ 220  
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 639 $ 639   639    
Treasury Stock, Shares, Constructively Retired   64.49 64.58      
The Dow Chemical Company [Member]            
Related Party Transaction [Line Items]            
Related Party Transaction, Expenses from Transactions with Related Party $ 379   $ 399 1,011 1,392  
Service Fee with Parent 10.00%          
Notes Receivable, Related Parties $ 1,500 $ 1,300   1,500    
Line of Credit Facility, Maximum Borrowing Capacity 1,000     1,000    
Line of Credit Facility, Remaining Borrowing Capacity 948 $ 940   948    
Payments of Dividends $ 55   $ 0 455 $ 220  
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions 100.00%          
Dow International Holding Company [Member]            
Related Party Transaction [Line Items]            
Common Stock, Related Company           462.7096
Ownership Interest Percentage, Related Company     15.00%   15.00% 19.10%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures     $ 174   $ 174  
Sundry income (expense) [Member] | The Dow Chemical Company [Member]            
Related Party Transaction [Line Items]            
Related Party Transaction, Expenses from Transactions with Related Party $ 7   7 21 22  
Cost of Sales [Member] | The Dow Chemical Company [Member]            
Related Party Transaction [Line Items]            
Related Party Transaction, Expenses from Transactions with Related Party $ 19   $ 18 $ 53 $ 51  
The Dow Chemical Company [Member] | Dow International Holding Company [Member]            
Related Party Transaction [Line Items]            
Ownership Interest Percentage, Related Company           80.90%