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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Environmental Matters [Abstract]    
Beginning of period $ 591us-gaap_AccrualForEnvironmentalLossContingencies  
Accruals for environmental matters deemed probable and reasonably estimable 46us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses  
Environmental liability payments (35)us-gaap_AccrualForEnvironmentalLossContingenciesPayments  
End of period 602us-gaap_AccrualForEnvironmentalLossContingencies  
Loss Contingency Classification of Accrual [Abstract]    
Accrued liabilities 278us-gaap_AccruedEnvironmentalLossContingenciesCurrent 278us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Other liabilities 324us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent 313us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Total environmental liabilities $ 602us-gaap_AccrualForEnvironmentalLossContingencies