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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Tables) | 3 Months Ended
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Mar. 31, 2018
Accrual for Environmental Loss Contingencies Disclosure [Abstract] |
Schedule of environmental liabilities, current and non-current |
(Dollars in millions) | March 31, 2018 |  | December 31, 2017
Environmental contingent liabilities, current | $ | 25 |  |  | $ | 25 |
Environmental contingent liabilities, long-term | 277 |  |  | 279 |
Total | $ | 302 |  |  | $ | 304 |
Schedule of changes to environmental remediation liabilities |
(Dollars in millions) | Environmental Remediation Liabilities
Balance at December 31, 2017 | $ | 280 |
Changes in estimates recognized in earnings and other | 1 |
Cash reductions | (3 | )
Balance at March 31, 2018 | $ | 278 |

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