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CONTINGENCIES (Environmental Obligations) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) project state | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2017 USD ($) divisions site | Sep. 29, 2021 divisions
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 | $ 1,664 | $ 1,584 | $ 1,561 |  |
Accretion Expense | 110 | 104 | 102 |  |
Additionsb | 57 | 60 | 38 |  |
Reductions | (14) | (20) | (58) |  |
Spending | (77) | (64) | (59) |  |
Balance at end of year | 1,740 | 1,664 | 1,584 |  |
Less current portion | (125) | (64) | (83) |  |
Long-term portion | 1,615 | $ 1,600 | 1,501 |  |
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract] |  |  |  |  |
2022 | 125 |  |  |  |
2023 | 120 |  |  |  |
2024 | 93 |  |  |  |
2025 | 100 |  |  |  |
2026 | 97 |  |  |  |
Thereafter | 3,200 |  |  |  |
Estimated environmental obligations on a discounted basis | 1,600 |  |  |  |
Estimated environmental obligations on an undiscounted and unescalated | $ 3,700 |  |  |  |
Environmental Loss Contingency, Number of Uranium Sites on Tribal Lands | divisions |  |  |  | 94 | 23
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 |
Active remediation projects, percent | 60.00% |  |  |  |
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 | 4,100 |  |  |  |
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 | 1,500 |  |  |  |
Newtown Creek |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |
Balance at end of year | 338 |  |  |  |
Sixty Percent of Remediation Projects |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |
Balance at end of year | 20 |  |  |  |
Pinal Creek, AZ |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |
Balance at end of year | 437 |  |  |  |
Historical Smelter Sites |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |
Balance at end of year | 268 |  |  |  |
Uranium Mining Sites |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |
Balance at end of year | $ 439 |  |  |  |

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