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ENVIRONMENTAL MATTERS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |
Beginning of period | $ 285 |  |
End of period | $ 281 | $ 285 |
Expected Payment Period of Environmental Contingencies | 30 years |  |
Accrual for Environmental Loss Contingencies [Abstract] |  |  |
Accrued Environmental Loss Contingencies, Current | $ 20 | 15 |
Accrued Environmental Loss Contingencies, Noncurrent | 261 | 270 |
Environmental Costs [Abstract] |  |  |
Cash expenditures related to environmental protection and improvement | 281 | 265 | $ 244
Environmental capital expenditures | 38 | 42 | 27
Environmental Remediation [Member] |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |
Beginning of period | 257 | 260 |
Changes in estimates recorded to earnings and other | 9 | 7 |
Cash reductions | (13) | (10) |
End of period | 253 | 257 | $ 260
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 | 110 |  |
Loss Contingency, Estimate of Possible Loss | 200 |  |
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 |
Minimum [Member] | Environmental Remediation [Member] |  |  |
Site Contingency [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | 253 | 257 |
Maximum [Member] | Environmental Remediation [Member] |  |  |
Site Contingency [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | $ 473 | $ 501 |

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