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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Tables) | 6 Months Ended
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Jun. 30, 2021
Accrual for Environmental Loss Contingencies Disclosure [Abstract] |
Schedule of environmental liabilities, current and non-current |
(Dollars in millions) | June 30, 2021 |  | December 31, 2020
Environmental contingencies, current | $ | 15 |  |  | $ | 15 |
Environmental contingencies, long-term | 271 |  |  | 270 |
Total | $ | 286 |  |  | $ | 285 |
Schedule of changes to environmental remediation liabilities | Changes in the reserves for environmental remediation liabilities during first six months 2021 and full year 2020 are summarized below:
(Dollars in millions) | Environmental Remediation Liabilities
Balance at December 31, 2019 | $ | 260 |
Changes in estimates recognized in earnings and other | 7 |
Cash reductions | (10) |
Balance at December 31, 2020 | 257 |
Changes in estimates recognized in earnings and other | 7 |
Cash reductions | (6) |
Balance at June 30, 2021 | $ | 258 |

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- Definition Roll Forward Of Environmental Remediation Liabilities [Table Text Block] + References No definition available. + Details
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