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ENVIRONMENTAL MATTERS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period $ 304    
End of period $ 296 $ 304  
Expected Payment Period of Environmental Contingencies 30 years    
Accrual for Environmental Loss Contingencies [Abstract]      
Accrued Environmental Loss Contingencies, Current $ 25 25  
Accrued Environmental Loss Contingencies, Noncurrent 271 279  
Environmental Costs [Abstract]      
Cash expenditures related to environmental protection and improvement 274 257 $ 267
Environmental capital expenditures 44 38 $ 45
Environmental Remediation [Member]      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period 280    
Changes in estimates recorded to earnings and other 7    
Cash reductions (16)    
End of period $ 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 $ 93    
Accrual for Environmental Loss Contingencies, Significant Assumptions accrued for estimated future remediation costs at the Shared Sites, over a period of approximately 30 years    
Loss Contingency, Estimate of Possible Loss $ 203    
Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation 25 24  
Non Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation 46 49  
Minimum [Member] | Environmental Remediation [Member]      
Site Contingency [Line Items]      
Loss Contingency, Estimate of Possible Loss 271 280  
Maximum [Member] | Environmental Remediation [Member]      
Site Contingency [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 508 $ 483