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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2024
Segment Reporting [Abstract]  
Segment Information
Segment information is summarized in the following table: 
(Dollars in millions)Three months ended March 31,
20242023
Revenues:  
Commercial lines insurance  
Commercial casualty$365 $377 
Commercial property336 299 
Commercial auto220 213 
Workers' compensation61 74 
Other commercial 100 93 
Commercial lines insurance premiums1,082 1,056 
Fee revenues1 1 
Total commercial lines insurance1,083 1,057 
Personal lines insurance  
Personal auto208 166 
Homeowner303 232 
Other personal77 66 
Personal lines insurance premiums588 464 
Fee revenues1 1 
Total personal lines insurance589 465 
Excess and surplus lines insurance139 127 
Fee revenues1 — 
Total excess and surplus lines insurance140 127 
Life insurance premiums79 77 
Fee revenues1 2 
Total life insurance80 79 
Investments
    Investment income, net of expenses245 210 
    Investment gains and losses, net612 106 
Total investment revenue857 316 
Other
Premiums183 194 
Other3 3 
Total other revenues186 197 
Total revenues$2,935 $2,241 
Income (loss) before income taxes:  
Insurance underwriting results  
Commercial lines insurance$39 $(2)
Personal lines insurance37 (57)
Excess and surplus lines insurance12 13 
Life insurance10 8 
Investments826 286 
Other29 20 
Total income before income taxes$953 $268 
Identifiable assets:March 31,
2024		December 31,
2023
Property casualty insurance$5,298 $5,294 
Life insurance1,564 1,562 
Investments25,878 24,999 
Other987 914 
Total$33,727 $32,769