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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Tables)
3 Months Ended
Mar. 31, 2024
Accrual for Environmental Loss Contingencies Disclosure [Abstract]  
Schedule of environmental liabilities, current and non-current
(Dollars in millions)March 31, 2024December 31, 2023
Environmental contingencies, current$10 $10 
Environmental contingencies, long-term272 274 
Total$282 $284 
Schedule of changes to environmental remediation liabilities
Changes in the reserves for environmental remediation liabilities during first three months 2024 and full year 2023 are summarized below:
(Dollars in millions)Environmental Remediation Liabilities
Balance at December 31, 2022
$245 
Changes in estimates recognized in earnings and other19 
Cash reductions(12)
Balance at December 31, 2023
252 
Changes in estimates recognized in earnings and other
Cash reductions(3)
Balance at March 31, 2024$250