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Segment Information
 9 Months Ended
Sep. 30, 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 September 30,Nine months ended September 30,
2025202420252024
Commercial lines insurance    
Commercial lines insurance premiums$1,229 $1,137 $3,620 $3,326 
Fee revenues2 1 4 3 
Total commercial lines insurance revenues1,231 1,138 3,624 3,329 
Loss and loss expenses747 706 2,249 2,171 
Underwriting expenses373 351 1,080 1,028 
Total commercial lines income before income taxes111 81 295 130 
Personal lines insurance   
Personal lines insurance premiums838 678 2,340 1,897 
Fee revenues1 2 4 4 
Total personal lines insurance revenues839 680 2,344 1,901 
Loss and loss expenses507 553 1,951 1,421 
Underwriting expenses233 196 665 554 
Total personal lines income (loss) before income taxes99 (69)(272)(74)
Excess and surplus lines insurance
Excess and surplus lines insurance premiums174 157 510 447 
Fee revenues1 — 3 2 
Total excess and surplus lines insurance revenues175 157 513 449 
Loss and loss expenses108 107 317 299 
Underwriting expenses48 42 141 122 
Total excess and surplus lines income before income taxes19 8 55 28 
Life insurance
Life insurance premiums83 80 246 240 
Fee revenues1 1 4 4 
Total life insurance revenues84 81 250 244 
Contract holders' benefits incurred7679 230 226 
Investment interest credited to contract holders(32)(32)(95)(94)
Underwriting expenses incurred2324 70 70 
Total life insurance income before income taxes17 10 45 42 
Investments
    Investment income, net of expenses295 258 860 745 
    Investment gains and losses, net853 758 1,259 1,507 
Total investment revenue1,148 1,016 2,119 2,252 
Investment interest credited to contract holders32 32 95 94 
Total investment income before income taxes1,116 984 2,024 2,158 
Reconciliation to condensed consolidated income before income taxes
Total segment revenues3,477 3,072 8,850 8,175 
Other earned premiums243 245 675 614 
Other revenues6 3 15 10 
Total revenues3,726 3,320 9,540 8,799 
Total segment benefits and expenses2,115 2,058 6,703 5,891 
Other loss and loss expenses102 133 421 290 
Other underwriting expenses77 70 209 180 
Other benefits and expenses19 19 67 59 
Total benefits and expenses2,313 2,280 7,400 6,420 
Total income before income taxes$1,413 $1,040 $2,140 $2,379 
Identifiable assets by segment are summarized in the following table:
(Dollars in millions)September 30,December 31,
20252024
Identifiable assets:
Property casualty insurance$7,078 $5,927 
Life insurance1,689 1,658 
Investments30,575 27,887 
Other1,225 1,029 
Total$40,567 $36,501