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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Accrual for Environmental Loss Contingencies [Roll Forward]    
Beginning of period $ 660  
Accruals for environmental matters deemed probable and reasonably estimable 83  
Environmental liability payments (112)  
Other 1  
End of period 632  
Loss Contingency, Classification of Accrual [Abstract]    
Accrued liabilities 225 $ 225
Other liabilities 407 435
Total environmental liabilities $ 632 $ 660