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Severance (Tables)
9 Months Ended
Sep. 30, 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:

Severance

(Dollars in millions)
Balance at December 31, 2023$18 
Accrued to expense119 
Payments, net(122)
Balance at September 30, 2024$15