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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Accrual for Environmental Loss Contingencies [Roll Forward] |  |
Beginning of period | $ 287 |
End of period | 287 | $ 287
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract] |  |
Accrued Environmental Loss Contingencies, Current | 15 | 20
Accrued Environmental Loss Contingencies, Noncurrent | 272 | 267
Environmental Remediation [Member] |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |
Beginning of period | 260 | 271
Changes in estimates recognized in earnings and other | 9 | 4
Cash reductions | (9) | (15)
End of period | $ 260 | 260
Expected Payment Period of Environmental Contingencies | approximately 30 years |
Environmental Remediation [Member] | Minimum [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 260 | 260
Environmental Remediation [Member] | Maximum [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 504 | 487
Environmental ARO [Member] |  |
Site Contingency [Line Items] |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | 27 | 27
Non Environmental ARO [Member] |  |
Site Contingency [Line Items] |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | $ 50 | $ 48

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