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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2022
Segment Reporting [Abstract]  
Segment Information
Segment information is summarized in the following table: 
(Dollars in millions)Three months ended March 31,
20222021
Revenues:  
Commercial lines insurance  
Commercial casualty$336 $303 
Commercial property274 253 
Commercial auto205 193 
Workers' compensation67 67 
Other commercial 80 70 
Commercial lines insurance premiums962 886 
Fee revenues1 1 
Total commercial lines insurance963 887 
Personal lines insurance  
Personal auto152 152 
Homeowner195 174 
Other personal55 50 
Personal lines insurance premiums402 376 
Fee revenues1 1 
Total personal lines insurance403 377 
Excess and surplus lines insurance112 89 
Fee revenues1 — 
Total excess and surplus lines insurance113 89 
Life insurance premiums72 69 
Fee revenues1 1 
Total life insurance73 70 
Investments
    Investment income, net of expenses185 174 
    Investment gains and losses, net(666)504 
Total investment revenue(481)678 
Other
Premiums142 124 
Other2 2 
Total other revenues144 126 
Total revenues$1,215 $2,227 
Income (loss) before income taxes:  
Insurance underwriting results  
Commercial lines insurance$76 $130 
Personal lines insurance65 (3)
Excess and surplus lines insurance16 8 
Life insurance(2)(2)
Investments(508)652 
Other(7)(17)
Total income (loss) before income taxes$(360)$768 
Identifiable assets:March 31,
2022		December 31,
2021
Property casualty insurance$4,607 $4,421 
Life insurance1,577 1,590 
Investments23,201 24,481 
Other865 895 
Total$30,250 $31,387