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ENVIRONMENTAL MATTERS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Site Contingency [Line Items]      
Portion Of Environmental Reserve Related To Previously Closed, Impaired, And Divested Sites $ 7 $ 8  
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period 321    
End of period 304 321  
Accrual for Environmental Loss Contingencies [Abstract]      
Accrued Environmental Loss Contingencies, Current 25 30  
Accrued Environmental Loss Contingencies, Noncurrent 279 291  
Environmental Costs [Abstract]      
Cash expenditures related to environmental protection and improvement 257 267 $ 290
Environmental capital expenditures 38 45  
Environmental Remediation [Member]      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period 295    
Cash reductions (15)    
End of period $ 280 295  
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 $ 84    
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 $ 204    
Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation 24 26  
Non Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation 49 46  
Minimum [Member] | Environmental Remediation [Member]      
Site Contingency [Line Items]      
Loss Contingency, Estimate of Possible Loss 280 295  
Maximum [Member] | Environmental Remediation [Member]      
Site Contingency [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 483 $ 503