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ENVIRONMENTAL MATTERS (Tables) | 12 Months Ended
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Dec. 31, 2017
Environmental Matters [Abstract] |
Schedule of Environmental Liabilities, Current and Non-current |
(Dollars in millions) | December 31,
| 2017 |  | 2016
Environmental contingent liabilities, current | $ | 25 |  |  | $ | 30 |
Environmental contingent liabilities, long-term | 279 |  |  | 291 |
Total | $ | 304 |  |  | $ | 321 |
Schedule of Changes to Environmental Remediation Liabilities |
(Dollars in millions) | Environmental Remediation Liabilities
Balance at December 31, 2016 | $ | 295 |
Cash reductions | (15 | )
Balance at December 31, 2017 | $ | 280 |

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