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Severance (Tables)
6 Months Ended
Jun. 30, 2025
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:

Severance

(Dollars in millions)
Balance at December 31, 2024$12 
Accrued to expense18 
Payments, net(19)
Balance at June 30, 2025$11