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ENVIRONMENTAL MATTERS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Site Contingency [Line Items]      
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 336 345  
Accrual for Environmental Loss Contingencies [Abstract]      
Accrued Environmental Loss Contingencies, Current 35 35  
Accrued Environmental Loss Contingencies, Noncurrent 301 310  
Environmental Costs [Abstract]      
Cash expenditures related to environmental protection and improvement 290 319 $ 285
Cash expenditures for environmental engineering and construction costs 61 79  
Environmental Remediation [Member]      
Site Contingency [Line Items]      
Loss Contingency, Range of Possible Loss, Minimum 308 324  
Loss Contingency, Range of Possible Loss, Maximum 516 548  
Accrual for Environmental Loss Contingencies [Roll Forward]      
Beginning of period 324    
Changes in estimates recorded to earnings and other 12    
Cash reductions (28)    
End of period 308 324  
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 $ 71    
Accrual for Environmental Loss Contingencies, Significant Assumptions accrued for estimated future remediation costs at the Shared Sites, over a period of thirty years    
Loss Contingency, Estimate of Possible Loss $ 205    
Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation 28 21  
Non Environmental ARO [Member]      
Site Contingency [Line Items]      
Best Estimate Accrued to-date For Asset Retirement Obligation $ 46 $ 44