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ENVIRONMENTAL MATTERS (Tables)
 12 Months Ended
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