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ENVIRONMENTAL MATTERS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period $ 287    
End of period $ 285 $ 287  
Expected Payment Period of Environmental Contingencies 30 years    
Accrual for Environmental Loss Contingencies [Abstract]      
Accrued Environmental Loss Contingencies, Current $ 15 20  
Accrued Environmental Loss Contingencies, Noncurrent 270 267  
Environmental Costs [Abstract]      
Cash expenditures related to environmental protection and improvement 265 244 $ 274
Environmental capital expenditures 42 27 44
Environmental Remediation [Member]      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period 260 271  
Changes in estimates recorded to earnings and other 7 4  
Cash reductions (10) (15)  
End of period $ 257 260 $ 271
Expected Payment Period of Environmental Contingencies approximately 30 years    
Shared Sites [Member]      
Site Contingency [Line Items]      
Maximum funding required for environmental shared sites $ 325    
Amounts paid for Environmental Remediation to Date for Shared Sites 104    
Loss Contingency, Estimate of Possible Loss 200    
Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation 28 27  
Non Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation 51 48  
Minimum [Member] | Environmental Remediation [Member]      
Site Contingency [Line Items]      
Loss Contingency, Estimate of Possible Loss 257 260  
Maximum [Member] | Environmental Remediation [Member]      
Site Contingency [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 501 $ 487