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CONTINGENCIES (Environmental Obligations) (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 17, 2017 USD ($) divisions site | Dec. 31, 2020 USD ($) project state | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Site Contingency [Line Items] |  |  |  |
Number of remediation projects | project |  | 100 |  |
Number of US States with remediation projects | state |  | 24 |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |
Balance at beginning of year |  | $ 1,561 | $ 1,511 | $ 1,439
Accretion Expense |  | 102 | 102 | 100
Additionsb |  | 38 | 23 | 56
Reductions |  | (58) | (1) | 0
Spending |  | (59) | (74) | (84)
Balance at end of year |  | 1,584 | 1,561 | 1,511
Less current portion |  | (83) | (106) | (132)
Long-term portion |  | 1,501 | $ 1,455 | $ 1,379
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract] |  |  |  |
2020 |  | 83 |  |
2021 |  | 95 |  |
2022 |  | 100 |  |
2023 |  | 100 |  |
2024 |  | 100 |  |
Thereafter |  | 3,200 |  |
Estimated environmental obligations on a discounted basis |  | 1,500 |  |
Estimated environmental obligations on an undiscounted and unescalated |  | 3,700 |  |
Environmental Loss Contingency, Number of Uranium Sites on Tribal Lands | divisions | 94 |  |  |
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 |  |  |
Reduction of environmental obligation due to deceleration of work cause by COVID-19 |  | 47 |  |
Number of site surveys being performed to mining claims | site | 15,000 |  |  |
Minimum |  |  |  |
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract] |  |  |  |
Estimated environmental obligations on an undiscounted and unescalated |  | 3,300 |  |
Maximum |  |  |  |
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract] |  |  |  |
Estimated environmental obligations on an undiscounted and unescalated |  | 4,200 |  |
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 |  | $ 1,400 |  |

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