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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Accrual for Environmental Loss Contingencies [Roll Forward] |  |
Beginning of period | $ 281 |
End of period | 278 | $ 281
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract] |  |
Accrued Environmental Loss Contingencies, Current | 20 | 20
Accrued Environmental Loss Contingencies, Noncurrent | 258 | 261
Environmental Remediation [Member] |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |
Beginning of period | 253 | 257
Changes in estimates recognized in earnings and other | 1 | 9
Cash reductions | (4) | (13)
End of period | $ 250 | 253
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 | 253
Environmental Remediation [Member] | Maximum [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 468 | 473
Environmental ARO [Member] |  |
Site Contingency [Line Items] |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | 28 | 28
Non Environmental ARO [Member] |  |
Site Contingency [Line Items] |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | $ 51 | $ 51

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