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Segment Information
 3 Months Ended
Mar. 31, 2025
Segment Reporting [Abstract]  
Segment Information Segment Information
We operate primarily in two industries, property casualty insurance and life insurance. Our chief operating decision maker (CODM) is the chief executive officer who 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 2024 Annual Report on Form 10-K, Item 8, Note 18, Segment Information, Page 176, for a description of revenue, income or loss before income taxes, including its components, 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,
20252024
Commercial lines insurance  
Commercial lines insurance premiums$1,179 $1,082 
Fee revenues2 1 
Total commercial lines insurance revenues1,181 1,083 
Loss and loss expenses735 719 
Underwriting expenses349 325 
Total commercial lines income before income taxes97 39 
Personal lines insurance  
Personal lines insurance premiums698 588 
Fee revenues1 1 
Total personal lines insurance revenues699 589 
Loss and loss expenses846 379 
Underwriting expenses210 173 
Total personal lines income (loss) before income taxes(357)37 
Excess and surplus lines insurance
Excess and surplus lines insurance premiums162 139 
Fee revenues1 1 
Total excess and surplus lines insurance revenues163 140 
Loss and loss expenses99 90 
Underwriting expenses44 38 
Total excess and surplus lines income before income taxes20 12 
Life insurance
Life insurance premiums80 79 
Fee revenues1 1 
Total life insurance revenues81 80 
Contract holders' benefits incurred81 79 
Investment interest credited to contract holders(32)(31)
Underwriting expenses incurred23 22 
Total life insurance income before income taxes9 10 
Investments
    Investment income, net of expenses280 245 
    Investment gains and losses, net(67)612 
Total investment revenue213 857 
Investment interest credited to contract holders32 31 
Total investment income before income taxes181 826 
Reconciliation to condensed consolidated income (loss) before income taxes
Total segment revenues2,337 2,749 
Other earned premiums225 183 
Other revenues4 3 
Total revenues2,566 2,935 
Total segment benefits and expenses2,387 1,825 
Other loss and loss expenses207 82 
Other underwriting expenses76 58 
Other benefits and expenses24 17 
Total benefits and expenses2,694 1,982 
Total income (loss) before income taxes$(128)$953 
Identifiable assets by segment are summarized in the following table:
(Dollars in millions)March 31,December 31,
20252024
Identifiable assets:
Property casualty insurance$6,481 $5,927 
Life insurance1,684 1,658 
Investments27,967 27,887 
Other1,144 1,029 
Total$37,276 $36,501