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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
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 321  
End of period 318  
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]    
Accrued Environmental Loss Contingencies, Current 30 30
Accrued Environmental Loss Contingencies, Noncurrent 288 291
Environmental Remediation [Member]    
Accrual for Environmental Loss Contingencies [Roll Forward]    
Beginning of period 295  
Changes in estimates recognized in earnings and other 2  
Cash reductions (6)  
End of period $ 291  
Expected Payment Period of Environmental Contingencies approximately 30 years  
Environmental ARO [Member]    
Site Contingency [Line Items]    
Best Estimate Accrued to-date For Asset Retirement Obligation $ 27 26
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 291 295
Maximum [Member] | Environmental Remediation [Member]    
Site Contingency [Line Items]    
Loss Contingency, Estimate of Possible Loss $ 497 $ 503