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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 |  |

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