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ENVIRONMENTAL MATTERS (Tables) | 12 Months Ended
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Dec. 31, 2020
Environmental Matters [Abstract] |
Schedule of Environmental Liabilities, Current and Non-current |
(Dollars in millions) | December 31,
| 2020 |  | 2019
Environmental contingencies, current | $ | 15 |  |  | $ | 20 |
Environmental contingencies, long-term | 270 |  |  | 267 |
Total | $ | 285 |  |  | $ | 287 |
Schedule of Changes to Environmental Remediation Liabilities |
(Dollars in millions) | Environmental Remediation Liabilities
Balance at December 31, 2018 | $ | 271 |
Changes in estimates recognized in earnings and other | 4 |
Cash reductions | (15) |
Balance at December 31, 2019 | 260 |
Changes in estimates recognized in earnings and other | 7 |
Cash reductions | (10) |
Balance at December 31, 2020 | $ | 257 |

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