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ENVIRONMENTAL MATTERS (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Site Contingency [Line Items]      
Amount Accrued to Date for Environmental Contingent Liabilities $ 345 $ 339 $ 345
Portion Of Environmental Reserve Related To Previously Closed, Impaired, And Divested Sites   8 10
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period 345    
End of period 339    
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]      
Accrued Environmental Loss Contingencies, Current   35 35
Accrued Environmental Loss Contingencies, Noncurrent   304 310
Amount Accrued to Date for Environmental Contingent Liabilities 345 339 345
Environmental Remediation [Member]      
Site Contingency [Line Items]      
Amount Accrued to Date for Environmental Contingent Liabilities 324 315 324
Loss Contingency, Range of Possible Loss, Minimum   315 324
Loss Contingency, Range of Possible Loss, Maximum   526 548
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period 324    
Accrual for Environmental Loss Contingencies, Increase (Decrease) for Revision in Estimates 11    
Cash reductions (20)    
End of period 315    
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]      
Amount Accrued to Date for Environmental Contingent Liabilities $ 324 315 324
Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation   24 21
Non Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation   $ 43 $ 44