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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Tables)
 9 Months Ended
Sep. 30, 2018
Accrual for Environmental Loss Contingencies Disclosure [Abstract]  
Schedule of environmental liabilities, current and non-current
(Dollars in millions)
September 30, 2018
 
December 31, 2017
Environmental contingent liabilities, current
$
25

 
$
25

Environmental contingent liabilities, long-term
272

 
279

Total
$
297

 
$
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
6

Cash reductions
(13
)
Balance at September 30, 2018
$
273