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COMMITMENTS AND CONTINGENT LIABILITIES (Dow v Nova) (Details) - Dow V. Nova Chemicals Corporation Patent Infringement Matter
$ in Millions, $ in Millions
3 Months Ended
Jul. 06, 2017
USD ($)
Jun. 29, 2017
USD ($)
Jun. 29, 2017
CAD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items]            
Settlement amount   $ 495 $ 645      
Proceeds from settlements $ 501          
Litigation settlement       $ 160    
Estimated liability         $ 341 $ 341
Nonoperating Income (Expense)            
Loss Contingencies [Line Items]            
Litigation settlement       137    
Selling, General and Administrative Expenses            
Loss Contingencies [Line Items]            
Litigation settlement       $ 23