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Supplementary Information Concerning Property Casualty Insurance Operations
 12 Months Ended
Dec. 31, 2024
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,
 202420232022
Deferred policy acquisition costs:   
Commercial lines insurance$431 $387 $372 
Personal lines insurance276 210 168 
Excess and surplus lines insurance50 43 37 
Other129 109 105 
Total$886 $749 $682 
Reserves for unpaid claims and claim adjustment expenses:   
Commercial lines insurance$6,303 $5,887 $5,568 
Personal lines insurance1,209 990 916 
Excess and surplus lines insurance1,109 932 753 
Other1,316 1,166 1,099 
Total$9,937 $8,975 $8,336 
Reserve discount deducted$— $— $— 
Gross unearned premiums:   
Commercial lines insurance$2,311 $2,111 $2,021 
Personal lines insurance1,633 1,253 994 
Excess and surplus lines insurance321 273 236 
Other547 481 437 
Total$4,812 $4,118 $3,688 
Earned premiums:   
Commercial lines insurance$4,486 $4,264 $4,024 
Personal lines insurance2,623 2,044 1,689 
Excess and surplus lines insurance615 542 485 
Other844 795 726 
Total$8,568 $7,645 $6,924 
Investment income, net of expenses:   
Commercial lines insurance$— $— $— 
Personal lines insurance— — — 
Excess and surplus lines insurance— — — 
Other— — — 
Total (1)$715 $602 $509 

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,
 202420232022
Loss and loss expenses incurred related to current accident year:   
Commercial lines insurance$2,933 $2,910 $2,837 
Personal lines insurance1,821 1,506 1,227 
Excess and surplus lines insurance403 361 324 
Other515 396 487 
Total$5,672 $5,173 $4,875 
Loss and loss expenses incurred related to prior accident years:   
Commercial lines insurance$(138)$(123)$(76)
Personal lines insurance(26)(64)(61)
Excess and surplus lines insurance8 (11)(9)
Other(80)(17)(13)
Total$(236)$(215)$(159)
Amortization of deferred policy acquisition costs:   
Commercial lines insurance$853 $808 $769 
Personal lines insurance457 367 311 
Excess and surplus lines insurance102 89 79 
Other199 157 144 
Total$1,611 $1,421 $1,303 
Paid loss and loss expenses:   
Commercial lines insurance$2,335 $2,480 $2,211 
Personal lines insurance1,565 1,353 1,071 
Excess and surplus lines insurance229 183 145 
Other252 260 260 
Total$4,381 $4,276 $3,687 
Net written premiums:   
Commercial lines insurance$4,690 $4,336 $4,159 
Personal lines insurance2,999 2,302 1,831 
Excess and surplus lines insurance654 570 502 
Other900 838 815 
Total$9,243 $8,046 $7,307