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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 and leased real estate
Changes in our accrued liabilities for severance expenses were as follows:
Years Ended December 31,
20242023
 (Dollars in millions)
Balance at beginning of period$18 11 
Accrued to expense130 74 
Payments, net(136)(67)
Balance at end of period$12 18