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COMMITMENTS AND CONTINGENT LIABILITIES (Nova Patent Infringement Matter) (Details)
$ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jul. 06, 2017
USD ($)
Jun. 29, 2017
USD ($)
Jun. 29, 2017
CAD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
CAD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]              
Document Period End Date           Sep. 30, 2019  
Gain (Loss) Related to Litigation Settlement       $ 205   $ 205  
Dow V. Nova Chemicals Corporation Patent Infringement Matter [Member]              
Loss Contingencies [Line Items]              
Litigation Settlement, Amount Awarded from Other Party   $ 495 $ 645        
Proceeds from Legal Settlements $ 501            
Other noncurrent obligations       341   341 $ 341
Nova Ethylene Asset Matter [Member]              
Loss Contingencies [Line Items]              
Litigation Settlement, Amount Awarded from Other Party       1,080 $ 1,430    
Gain (Loss) Related to Litigation Settlement       186      
Other noncurrent obligations       $ 893   $ 893