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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Tables)
 9 Months Ended
Sep. 30, 2019
Accrual for Environmental Loss Contingencies Disclosure [Abstract]  
Schedule of environmental liabilities, current and non-current
(Dollars in millions)
September 30, 2019
 
December 31, 2018
Environmental contingent liabilities, current
$
20

 
$
25

Environmental contingent liabilities, long-term
270

 
271

Total
$
290

 
$
296
Schedule of changes to environmental remediation liabilities Changes in the reserves for environmental remediation liabilities during first nine months 2019 and full year 2018 are summarized below:
(Dollars in millions)
Environmental Remediation Liabilities
Balance at December 31, 2017
$
280

Changes in estimates recognized in earnings and other
7

Cash reductions
(16
)
Balance at December 31, 2018
271

Changes in estimates recognized in earnings and other
3

Cash reductions
(11
)
Balance at September 30, 2019
$
263