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ENVIRONMENTAL MATTERS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period $ 296    
End of period $ 287 $ 296  
Expected Payment Period of Environmental Contingencies 30 years    
Accrual for Environmental Loss Contingencies [Abstract]      
Accrued Environmental Loss Contingencies, Current $ 20 25  
Accrued Environmental Loss Contingencies, Noncurrent 267 271  
Environmental Costs [Abstract]      
Cash expenditures related to environmental protection and improvement 244 274 $ 257
Environmental capital expenditures 27 44 38
Environmental Remediation [Member]      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period 271 280  
Changes in estimates recorded to earnings and other 4 7  
Cash reductions (15) (16)  
End of period $ 260 271 $ 280
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 99    
Loss Contingency, Estimate of Possible Loss 197    
Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation 27 25  
Non Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation 48 46  
Minimum [Member] | Environmental Remediation [Member]      
Site Contingency [Line Items]      
Loss Contingency, Estimate of Possible Loss 260 271  
Maximum [Member] | Environmental Remediation [Member]      
Site Contingency [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 487 $ 508