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NONCONSOLIDATED AFFILIATES (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 04, 2017
shares
Dec. 31, 2018
USD ($)
jointventures
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
jointventures
Dec. 31, 2017
USD ($)
jointventures
Dec. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
shares
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Dividends or Distributions       $ 663 $ 654 $ 612  
Noncash Dividend         7    
Investment in nonconsolidated affiliates   $ 3,320 $ 2,974 $ 3,320 $ 3,107 $ 2,974  
Equity Method Investment, Ownership Interest, Number of Affiliates | jointventures   38   38 39    
SCG-Dow Group              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage   50.00%   50.00%      
Exclusive of additional differences for Dow Corning and MEGlobal              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity   $ 39   $ 39 $ 63    
EQUATE Petrochemical Company K.S.C.              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity   (502)   (502) (516)    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity, Portion Amortized Over Remaining Useful Life   184   184 200    
Investment in nonconsolidated affiliates   $ 131   $ 131 $ 42    
Ownership percentage   42.50% 42.50% 42.50% 42.50% 42.50%  
Sadara Chemical Company              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage   35.00% 35.00% 35.00% 35.00% 35.00%  
Equity Method Investment, Conversion of Notes Receivable to Equity   $ 70   $ 312 $ 718    
AgroFresh              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity   $ 101   $ 101 $ 92    
Investment in nonconsolidated affiliates             $ 210
Equity Method Investment, Additional Information | shares             17,500,000
Ownership percentage   42.00%   42.00% 36.00%   35.00%
Equity Method Investment, Other than Temporary Impairment     $ 143        
Equity Method Investee | SCG-Dow Group              
Schedule of Equity Method Investments [Line Items]              
Concentration Risk, Percentage       2.00% 3.00% 3.00%  
Equity Method Investee | Sadara Chemical Company              
Schedule of Equity Method Investments [Line Items]              
Noncurrent receivables, Balance Due From Nonconsolidated Affiliates   $ 0   $ 0 $ 275    
Increase (Decrease) in Notes Receivable, Related Parties         $ 735    
Concentration Risk, Percentage       9.00% 4.00%    
Variable Interest Entity, Not Primary Beneficiary | AgroFresh              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Shares Purchased | shares 5,070,358            
Dow | Variable Interest Entity, Not Primary Beneficiary | AgroFresh              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Shares Purchased | shares 5,070,358            
Equity Method Investment. Percentage of Outstanding Common Stock Purchased 10.00%