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COMMITMENTS AND CONTINGENT LIABILITIES Nova Ethylene Asset Matter (Details)
$ in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2020
USD ($)
Oct. 11, 2019
USD ($)
Oct. 11, 2019
CAD ($)
Sep. 18, 2019
USD ($)
Sep. 18, 2019
CAD ($)
Oct. 24, 2019
CAD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Gain Contingencies [Line Items]                        
Gain (Loss) Related to Litigation Settlement             $ 0   $ 205 $ 6 $ 205  
Nova Ethylene Asset Matter [Member]                        
Gain Contingencies [Line Items]                        
Estimated Litigation Liability, Noncurrent             875     $ 875   $ 893
Litigation Settlement, Amount Awarded from Other Party $ 259     $ 1,080 $ 1,430              
Litigation settlement, Amount Awarded from Other Party - Withholding Tax           $ 347            
Proceeds from Legal Settlements   $ 800 $ 1,080                  
Gain (Loss) Related to Litigation Settlement               $ 18 186      
Nova Ethylene Asset Matter [Member] | Sundry Income (Expense), Net [Member]                        
Gain Contingencies [Line Items]                        
Gain (Loss) Related to Litigation Settlement             6   170      
Nova Ethylene Asset Matter [Member] | Selling, General and Administrative Expenses [Member]                        
Gain Contingencies [Line Items]                        
Gain (Loss) Related to Litigation Settlement             $ 12          
Nova Ethylene Asset Matter [Member] | Selling, general and administrative expenses                        
Gain Contingencies [Line Items]                        
Gain (Loss) Related to Litigation Settlement                 $ 16