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Severance (Tables)
12 Months Ended
Dec. 31, 2024
Restructuring and Related Activities [Abstract]  
Schedule of changes in accrued liabilities for severance expenses
Changes in our accrued liabilities for severance expenses were as follows:

Years Ended December 31,
20242023

(Dollars in millions)
Balance at beginning of period$$
Accrued to expense32 17 
Payments, net(29)(19)
Balance at end of period$$