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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Accrual for Environmental Loss Contingencies [Roll Forward] |  |
Beginning of period | $ 284 |
End of period | 282 | $ 284
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract] |  |
Accrued Environmental Loss Contingencies, Current | 10 | 10
Accrued Environmental Loss Contingencies, Noncurrent | 272 | 274
Environmental Remediation [Member] |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |
Beginning of period | 252 | 245
Changes in estimates recognized in earnings and other | 1 | 19
Cash reductions | (3) | (12)
End of period | $ 250 | 252
Expected Payment Period of Environmental Contingencies | approximately 30 years |
Environmental Remediation [Member] | Minimum [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 250 | 252
Environmental Remediation [Member] | Maximum [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 493 | 497
Environmental ARO [Member] |  |
Site Contingency [Line Items] |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | 32 | 32
Non Environmental ARO [Member] |  |
Site Contingency [Line Items] |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | $ 52 | $ 51

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