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CONTINGENCIES (Environmental Obligations) (Details) site in Thousands, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2017 USD ($) divisions | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) site state project | Dec. 31, 2016 USD ($) | Dec. 31, 2015 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 |  |  | $ 1,221 | $ 1,215 | $ 1,174
Accretion Expense |  |  | 84 | 81 | 78
Additions |  |  | 241 | 26 | 33
Reductions |  |  | (43) | (43) | (3)
Spending |  |  | (64) | (58) | (67)
Balance at end of year |  |  | 1,439 | 1,221 | 1,215
Less current portion |  |  | (134) | (129) | (100)
Long-term portion |  |  | 1,305 | $ 1,092 | $ 1,115
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract] |  |  |  |  |
2018 |  |  | 134 |  |
2019 |  |  | 132 |  |
2020 |  |  | 117 |  |
2021 |  |  | 119 |  |
2022 |  |  | 88 |  |
Thereafter |  |  | 2,700 |  |
Estimated environmental obligations on a discounted basis |  |  | 1,300 |  |
Estimated environmental obligations on an undiscounted and unescalated |  |  | $ 3,300 |  |
Number of site surveys being performed to mining claims | site |  |  | 5 |  |
Environmental Loss Contingency, Number of Uranium Sites on Tribal Lands | divisions | 94 |  |  |  |
Value of Consent Decree, Uranium Mines on Tribal Lands | $ 600 |  |  |  |
Remediation work related to Uranium mines, amount to be contributed by the U.S. Government | $ 335 |  |  |  |
Uranium mine remediation work, program term, in years | 20 years |  |  |  |
Minimum |  |  |  |  |
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract] |  |  |  |  |
Estimated environmental obligations on an undiscounted and unescalated |  |  | $ 2,800 |  |
Maximum |  |  |  |  |
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract] |  |  |  |  |
Estimated environmental obligations on an undiscounted and unescalated |  |  | 3,700 |  |
Pinal Creek, AZ; Newtown Creek, NY; Smelter Sites in Arizona, Indiana, Kansas, Missouri, New Jersey, Oklahoma, Pennsylvania; and Uranium Mining in Wester United States |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |
Balance at end of year |  |  | 1,300 |  |
Newtown Creek |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |
Additions |  |  | 138 |  |
Borough of Carteret |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |
Additions |  |  | $ 59 |  |
Uranium Mining Sites |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |
Reductions |  | $ (41) |  |  |

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