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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2025
Income Tax Disclosure [Abstract]  
Differences Between Statutory Income Tax Rate And Effective Income Tax Rate
The differences between the 21% statutory federal income tax rate and our effective income tax rate were as follows:
(Dollars in millions)Three months ended March 31,
20252024
Tax at statutory rate:$(27)21.0 %$200 21.0 %
Increase (decrease) resulting from:    
Tax-exempt income from municipal bonds(5)3.9 (5)(0.5)
Dividend received exclusion(5)3.9 (5)(0.5)
Other(1)0.9 0.8 
Provision (benefit) for income taxes$(38)29.7 %$198 20.8 %