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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Mar. 31, 2015
Sep. 18, 2015
Related Party Transaction [Line Items]          
Payments of Dividends $ 200     $ 220  
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures 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 $ 285     515  
Service Fee with Parent 10.00%        
Notes Receivable, Related Parties $ 1,400 $ 1,300      
Line of Credit Facility, Maximum Borrowing Capacity 1,000        
Notes Receivable, Related Parties, Noncurrent 940 $ 940      
Payments of Dividends $ 200     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%   19.10%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures     $ 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  
Cost of Sales [Member] | The Dow Chemical Company [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Expenses from Transactions with Related Party $ 16     $ 14  
The Dow Chemical Company [Member] | Dow International Holding Company [Member]          
Related Party Transaction [Line Items]          
Ownership Interest Percentage, Related Company         80.90%