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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
Mar. 31, 2020
USD ($)
Oct. 11, 2019
CAD ($)
Oct. 11, 2019
USD ($)
Sep. 18, 2019
CAD ($)
Sep. 18, 2019
USD ($)
Oct. 24, 2019
CAD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Gain Contingencies [Line Items]                
Estimated Litigation Liability, Noncurrent             $ 323 $ 323
Litigation Settlement, Amount Awarded from Other Party $ 259     $ 1,430 $ 1,080      
Litigation settlement, Amount Awarded from Other Party - Withholding Tax           $ 347    
Proceeds from Legal Settlements   $ 1,080 $ 800