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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Tables)
 9 Months Ended
Sep. 30, 2024
Accrual for Environmental Loss Contingencies Disclosure [Abstract]  
Schedule of environmental liabilities, current and non-current
The Company's net environmental reserve for environmental contingencies, including remediation costs and asset retirement obligations, is included as part of "Other noncurrent assets", "Payables and other current liabilities", and "Other long-term liabilities" on the Unaudited Consolidated Statements of Financial Position as follows:
(Dollars in millions)September 30, 2024December 31, 2023
Environmental contingencies, current$15 $10 
Environmental contingencies, long-term272 274 
Total$287 $284 
Schedule of changes to environmental remediation liabilities
Changes in the reserves for environmental remediation liabilities during first nine 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 other12 
Cash reductions(9)
Balance at September 30, 2024$255