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CONTINGENCIES (Environmental Obligations) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
state
project
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Site Contingency [Line Items]      
Number of remediation projects | project 100    
Number of US States with remediation projects | state 26    
Accrual for Environmental Loss Contingencies [Roll Forward]      
Balance at beginning of year $ 1,215 $ 1,174 $ 1,167
Accretion Expense 81 78 77
Additions 26 33 16
Reductions (43) (3) (6)
Spending (58) (67) (80)
Balance at end of year 1,221 1,215 1,174
Less current portion (129) (100) (105)
Long-term portion 1,092 $ 1,115 $ 1,069
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract]      
2017 129    
2018 108    
2019 90    
2020 95    
2021 103    
Thereafter 1,800    
Estimated environmental obligations on a discounted basis 1,100    
Estimated environmental obligations on an undiscounted and unescalated $ 2,300    
Number of environmental remediation sites evaluated, percent 50.00%    
Minimum      
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract]      
Estimated environmental obligations on an undiscounted and unescalated $ 2,100    
Maximum      
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract]      
Estimated environmental obligations on an undiscounted and unescalated 2,600    
Pinal Creek, AZ; Newtown Creek, NY; Smelter Sites in Arizona, Kansas, New Jersey, Oklahoma, Pennsylvania; and Uranium Mining in Wester United States      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Balance at end of year $ 1,100