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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Tables)
9 Months Ended
Sep. 30, 2020
Accrual for Environmental Loss Contingencies Disclosure [Abstract]  
Schedule of environmental liabilities, current and non-current
(Dollars in millions)September 30, 2020December 31, 2019
Environmental contingent liabilities, current$15 $20 
Environmental contingent liabilities, long-term272 267 
Total$287 $287 
Schedule of changes to environmental remediation liabilities Changes in the reserves for environmental remediation liabilities during first nine months 2020 and full year 2019 are summarized below:
(Dollars in millions)Environmental Remediation Liabilities
Balance at December 31, 2018$271 
Changes in estimates recognized in earnings and other
Cash reductions(15)
Balance at December 31, 2019260 
Changes in estimates recognized in earnings and other
Cash reductions(9)
Balance at September 30, 2020$260