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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Accrual for Environmental Loss Contingencies [Roll Forward]            
Beginning of period     $ 755      
Accruals for environmental matters deemed probable and reasonably estimable     169      
Environmental liability payments     (135)      
Other     (4)      
End of period $ 785   785      
Probable and reasonably estimable environmental liabilities, net of indemnities 6 $ 150 59 $ 334    
Loss Contingency, Classification of Accrual [Abstract]            
Accrued liabilities         $ 184 $ 175
Other liabilities         601 580
Total environmental liabilities $ 785   755   $ 785 $ 755
Sale Of Legacy Remediated Property [Member]            
Accrual for Environmental Loss Contingencies [Roll Forward]            
Probable and reasonably estimable environmental liabilities, net of indemnities     $ (43)