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Segment Information
 3 Months Ended
Mar. 31, 2024
Segment Reporting [Abstract]  
Segment Information Segment Information
We operate primarily in two industries, property casualty insurance and life insurance. Our CODM regularly reviews our reporting segments to make decisions about allocating resources and assessing performance. Our reporting segments are:
•Commercial lines insurance
•Personal lines insurance
•Excess and surplus lines insurance
•Life insurance
•Investments

We report as Other the noninvestment operations of the parent company and its noninsurer subsidiary, CFC Investment Company. We also report as Other the underwriting results of Cincinnati Re and Cincinnati Global. See our 2023 Annual Report on Form 10-K, Item 8, Note 18, Segment Information, Page 180, for a description of revenue, income or loss before income taxes and identifiable assets for each of the five segments.
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