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COMMITMENTS AND CONTINGENT LIABILITIES Nova Ethylene Asset Matter (Details) - Nova Ethylene Asset Matter [Member]
$ in Millions, $ in Millions
1 Months Ended 3 Months Ended
Oct. 11, 2019
USD ($)
Oct. 11, 2019
CAD ($)
Sep. 18, 2019
USD ($)
Sep. 18, 2019
CAD ($)
Oct. 24, 2019
CAD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Gain Contingencies [Line Items]              
Estimated Litigation Liability, Noncurrent           $ 893 $ 893
Litigation Settlement, Amount Awarded from Other Party     $ 1,080 $ 1,430   $ 259  
Litigation settlement, Amount Awarded from Other Party - Withholding Tax         $ 347    
Proceeds from Legal Settlements $ 800 $ 1,080