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ENVIRONMENTAL MATTERS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |
Beginning of period | $ 304 |  |
End of period | $ 296 | $ 304 |
Expected Payment Period of Environmental Contingencies | 30 years |  |
Accrual for Environmental Loss Contingencies [Abstract] |  |  |
Accrued Environmental Loss Contingencies, Current | $ 25 | 25 |
Accrued Environmental Loss Contingencies, Noncurrent | 271 | 279 |
Environmental Costs [Abstract] |  |  |
Cash expenditures related to environmental protection and improvement | 274 | 257 | $ 267
Environmental capital expenditures | 44 | 38 | $ 45
Environmental Remediation [Member] |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |
Beginning of period | 280 |  |
Changes in estimates recorded to earnings and other | 7 |  |
Cash reductions | (16) |  |
End of period | $ 271 | 280 |
Expected Payment Period of Environmental Contingencies | approximately 30 years |  |
Shared Sites [Member] |  |  |
Site Contingency [Line Items] |  |  |
Maximum funding required for environmental shared sites | $ 325 |  |
Amounts paid for Environmental Remediation to Date for Shared Sites | $ 93 |  |
Accrual for Environmental Loss Contingencies, Significant Assumptions | accrued for estimated future remediation costs at the Shared Sites, over a period of approximately 30 years |  |
Loss Contingency, Estimate of Possible Loss | $ 203 |  |
Environmental ARO [Member] |  |  |
Site Contingency [Line Items] |  |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | 25 | 24 |
Non Environmental ARO [Member] |  |  |
Site Contingency [Line Items] |  |  |
Best Estimate Accrued to-date For Asset Retirement Obligation | 46 | 49 |
Minimum [Member] | Environmental Remediation [Member] |  |  |
Site Contingency [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | 271 | 280 |
Maximum [Member] | Environmental Remediation [Member] |  |  |
Site Contingency [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | $ 508 | $ 483 |

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