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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2024
Income Tax Disclosure [Abstract]  
Tax Expense (Benefit) and Effective Tax Rate
Three Months Ended
September 30,
Nine Months Ended
September 30,
2024202320242023
(Dollars in millions)
Tax expense$24 $13 $62 $70 
Effective tax rate31.6 %18.6 %25.4 %25.1 %