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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
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 332  
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]    
Accrued Environmental Loss Contingencies, Current 30 35
Accrued Environmental Loss Contingencies, Noncurrent 302 301
Environmental Remediation [Member]    
Site Contingency [Line Items]    
Loss Contingency, Range of Possible Loss, Minimum 305 308
Loss Contingency, Range of Possible Loss, Maximum 507 516
Accrual for Environmental Loss Contingencies [Roll Forward]    
Beginning of period 308  
Accrual for Environmental Loss Contingencies, Increase (Decrease) for Revision in Estimates 3  
Cash reductions 6  
End of period $ 305  
Expected Payment Period of Environmental Contingencies 30 years  
Environmental ARO [Member]    
Site Contingency [Line Items]    
Best Estimate Accrued to-date For Asset Retirement Obligation $ 27 28
Non Environmental ARO [Member]    
Site Contingency [Line Items]    
Best Estimate Accrued to-date For Asset Retirement Obligation $ 45 $ 46