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COMMITMENTS AND CONTINGENT LIABILITIES COMMITMENTS AND CONTINGENT LIABILITIES (Bayer Arbitration Matter) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Bayer CropScience v. Dow AgroSciences        
Loss Contingencies [Line Items]        
Litigation settlement   $ 469 $ 0 $ 0
Bayer CropScience v. Dow AgroSciences | Dow Agrosciences LLC        
Loss Contingencies [Line Items]        
Damages awarded $ 455      
Litigation settlement   469    
Payments for legal settlements   $ 469