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Supplementary Information Concerning Property Casualty Insurance Operations
 12 Months Ended
Dec. 31, 2023
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]  
Supplementary Information Concerning Property Casualty Insurance Operations
Schedule VI
Cincinnati Financial Corporation and Subsidiaries
Supplementary Information Concerning Property Casualty Insurance Operations
(Dollars in millions)Years ended December 31,
 202320222021
Deferred policy acquisition costs:   
Commercial lines insurance$387 $372 $345 
Personal lines insurance210 168 145 
Excess and surplus lines insurance43 37 33 
Other109 105 79 
Total$749 $682 $602 
Reserves for unpaid claims and claim adjustment expenses:   
Commercial lines insurance$5,887 $5,568 $5,007 
Personal lines insurance990 916 814 
Excess and surplus lines insurance932 753 577 
Other1,166 1,099 831 
Total$8,975 $8,336 $7,229 
Reserve discount deducted$— $— $— 
Gross unearned premiums:   
Commercial lines insurance$2,111 $2,021 $1,857 
Personal lines insurance1,253 994 850 
Excess and surplus lines insurance273 236 207 
Other481 437 356 
Total$4,118 $3,688 $3,270 
Earned premiums:   
Commercial lines insurance$4,264 $4,024 $3,674 
Personal lines insurance2,044 1,689 1,542 
Excess and surplus lines insurance542 485 398 
Other795 726 570 
Total$7,645 $6,924 $6,184 
Investment income, net of expenses:   
Commercial lines insurance$— $— $— 
Personal lines insurance— — — 
Excess and surplus lines insurance— — — 
Other— — — 
Total (1)$602 $509 $457 

Note to Schedule VI:
(1) This segment information is not regularly allocated to segments and not reviewed by company management in making decisions about resources to be allocated to the segments or to assess their performance.
 Schedule VI (continued)
Cincinnati Financial Corporation and Subsidiaries
Supplementary Information Concerning Property Casualty Insurance Operations
(Dollars in millions)Years ended December 31,
 202320222021
Loss and loss expenses incurred related to current accident year:   
Commercial lines insurance$2,910 $2,837 $2,293 
Personal lines insurance1,506 1,227 1,042 
Excess and surplus lines insurance361 324 243 
Other396 487 446 
Total$5,173 $4,875 $4,024 
Loss and loss expenses incurred related to prior accident years:   
Commercial lines insurance$(123)$(76)$(353)
Personal lines insurance(64)(61)(50)
Excess and surplus lines insurance(11)(9)7 
Other(17)(13)(32)
Total$(215)$(159)$(428)
Amortization of deferred policy acquisition costs:   
Commercial lines insurance$808 $769 $703 
Personal lines insurance367 311 276 
Excess and surplus lines insurance89 79 63 
Other157 144 109 
Total$1,421 $1,303 $1,151 
Paid loss and loss expenses:   
Commercial lines insurance$2,480 $2,211 $1,806 
Personal lines insurance1,353 1,071 914 
Excess and surplus lines insurance183 145 118 
Other260 260 256 
Total$4,276 $3,687 $3,094 
Net written premiums:   
Commercial lines insurance$4,336 $4,159 $3,811 
Personal lines insurance2,302 1,831 1,594 
Excess and surplus lines insurance570 502 426 
Other838 815 648 
Total$8,046 $7,307 $6,479