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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Site Contingency [Line Items] |  |
Portion Of Environmental Reserve Related To Previously Closed, Impaired, And Divested Sites | $ 7 | $ 7
Accrual for Environmental Loss Contingencies [Roll Forward] |  |
Beginning of period | 304 |
End of period | 297 |
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract] |  |
Accrued Environmental Loss Contingencies, Current | 25 | 25
Accrued Environmental Loss Contingencies, Noncurrent | 272 | 279
Environmental Remediation [Member] |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |
Beginning of period | 280 |
Changes in estimates recognized in earnings and other | 6 |
Cash reductions | (13) |
End of period | $ 273 |
Expected Payment Period of Environmental Contingencies | approximately 30 years |
Environmental Remediation [Member] | Minimum [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 273 | 280
Environmental Remediation [Member] | Maximum [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 513 | 483
Environmental ARO [Member] |  |
Site Contingency [Line Items] |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | 24 | 24
Non Environmental ARO [Member] |  |
Site Contingency [Line Items] |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | $ 46 | $ 49

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