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COMMITMENTS AND CONTINGENT LIABILITIES (Asbestos-Related Matters of Union Carbide Corporation) (Details) - Union Carbide Corporation - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2002
Loss Contingencies [Line Items]        
Asbestos-related charge $ 1,113      
Asbestos Related Matters        
Loss Contingencies [Line Items]        
Liability for asbestos-related pending and future claims   $ 1,165 $ 1,260  
Percentage of recorded asbestos liability related to pending claims   18.00% 16.00%  
Percentage of recorded asbestos liability related to future claims   82.00% 84.00%  
Asbestos Related Matters, Pending and Future Claims        
Loss Contingencies [Line Items]        
Liability for asbestos-related pending and future claims       $ 2,200