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ENVIRONMENTAL MATTERS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Site Contingency [Line Items]      
Portion Of Environmental Reserve Related To Previously Closed, Impaired, And Divested Sites $ 8 $ 8  
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period 336    
End of period 321 336  
Accrual for Environmental Loss Contingencies [Abstract]      
Accrued Environmental Loss Contingencies, Current 30 35  
Accrued Environmental Loss Contingencies, Noncurrent 291 301  
Environmental Costs [Abstract]      
Cash expenditures related to environmental protection and improvement 267 290 $ 319
Environmental capital expenditures 45 52  
Environmental Remediation [Member]      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period 308    
Changes in estimates recorded to earnings and other 11    
Cash reductions (24)    
End of period $ 295 308  
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 $ 77    
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 $ 208    
Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation 26 28  
Non Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation 46 46  
Minimum [Member] | Environmental Remediation [Member]      
Site Contingency [Line Items]      
Loss Contingency, Estimate of Possible Loss 295 308  
Maximum [Member] | Environmental Remediation [Member]      
Site Contingency [Line Items]      
Loss Contingency, Estimate of Possible Loss $ 503 $ 516