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ENVIRONMENTAL MATTERS (Tables)
 12 Months Ended
Dec. 31, 2019
Environmental Matters [Abstract]  
Schedule of Environmental Liabilities, Current and Non-current
(Dollars in millions)
December 31,
 
2019
 
2018
Environmental contingent liabilities, current
$
20

 
$
25

Environmental contingent liabilities, long-term
267

 
271

Total
$
287

 
$
296
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
7

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

Changes in estimates recognized in earnings and other
4

Cash reductions
(15
)
Balance at December 31, 2019
$
260