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Segment Information
 9 Months Ended
Sep. 30, 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 September 30,Nine months ended September 30,
2024202320242023
Revenues:    
Commercial lines insurance    
Commercial casualty$381 $365 $1,118 $1,115 
Commercial property361 321 1,045 933 
Commercial auto231 216 679 644 
Workers' compensation61 66 182 212 
Other commercial 103 94 302 280 
Commercial lines insurance premiums1,137 1,062 3,326 3,184 
Fee revenues1 1 3 3 
Total commercial lines insurance1,138 1,063 3,329 3,187 
Personal lines insurance   
Personal auto242 185 674 524 
Homeowner352 271 981 755 
Other personal84 71 242 205 
Personal lines insurance premiums678 527 1,897 1,484 
Fee revenues2 1 4 3 
Total personal lines insurance680 528 1,901 1,487 
Excess and surplus lines insurance157 135 447 394 
Fee revenues— 1 2 2 
Total excess and surplus lines insurance157 136 449 396 
Life insurance premiums80 76 240 233 
Fee revenues1 3 4 8 
Total life insurance81 79 244 241 
Investments
    Investment income, net of expenses258 225 745 655 
    Investment gains and losses, net758 (456)1,507 84 
Total investment revenue1,016 (231)2,252 739 
Other
Premiums245 233 614 599 
Other3 3 10 8 
Total other revenues248 236 624 607 
Total revenues$3,320 $1,811 $8,799 $6,657 
Income (loss) before income taxes:    
Insurance underwriting results    
Commercial lines insurance$81 $52 $130 $83 
Personal lines insurance(69)1 (74)(92)
Excess and surplus lines insurance8 14 28 38 
Life insurance10 17 42 38 
Investments984 (262)2,158 648 
Other26 30 95 71 
Total income (loss) before income taxes$1,040 $(148)$2,379 $786 
Identifiable assets:September 30,
2024		December 31,
2023
Property casualty insurance$6,223 $5,294 
Life insurance1,654 1,562 
Investments27,640 24,999 
Other1,492 914 
Total$37,009 $32,769