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Supplementary Information Concerning Property Casualty Insurance Operations
 12 Months Ended
Dec. 31, 2020
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,
 202020192018
Deferred policy acquisition costs:   
Commercial lines insurance$317 $311 $291 
Personal lines insurance136 130 126 
Excess and surplus lines insurance28 25 21 
Other61 46 26 
Total$542 $512 $464 
Reserves for unpaid claims and claim adjustment expenses:   
Commercial lines insurance$4,881 $4,569 $4,466 
Personal lines insurance739 687 679 
Excess and surplus lines insurance446 351 298 
Other611 481 203 
Total$6,677 $6,088 $5,646 
Reserve discount deducted$— $— $— 
Gross unearned premiums:   
Commercial lines insurance$1,714 $1,665 $1,576 
Personal lines insurance797 757 725 
Excess and surplus lines insurance175 152 123 
Other273 213 91 
Total$2,959 $2,787 $2,515 
Earned premiums:   
Commercial lines insurance$3,476 $3,319 $3,218 
Personal lines insurance1,463 1,404 1,336 
Excess and surplus lines insurance325 278 234 
Other427 333 132 
Total$5,691 $5,334 $4,920 
Investment income, net of expenses:   
Commercial lines insurance$— $— $— 
Personal lines insurance— — — 
Excess and surplus lines insurance— — — 
Other— — — 
Total (1)$431 $419 $401 

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,
 202020192018
Loss and loss expenses incurred related to current accident year:   
Commercial lines insurance$2,431 $2,222 $2,206 
Personal lines insurance995 1,012 960 
Excess and surplus lines insurance192 153 128 
Other350 213 96 
Total$3,968 $3,600 $3,390 
Loss and loss expenses incurred related to prior accident years:   
Commercial lines insurance$(95)$(192)$(157)
Personal lines insurance(18)(27)13 
Excess and surplus lines insurance7 (11)(24)
Other(25)(18)1 
Total$(131)$(248)$(167)
Amortization of deferred policy acquisition costs:   
Commercial lines insurance$664 $631 $608 
Personal lines insurance256 251 242 
Excess and surplus lines insurance51 47 39 
Other86 57 18 
Total$1,057 $986 $907 
Paid loss and loss expenses:   
Commercial lines insurance$1,969 $2,023 $1,816 
Personal lines insurance921 966 913 
Excess and surplus lines insurance112 90 74 
Other181 181 44 
Total$3,183 $3,260 $2,847 
Net written premiums:   
Commercial lines insurance$3,534 $3,410 $3,245 
Personal lines insurance1,503 1,435 1,378 
Excess and surplus lines insurance348 303 249 
Other479 368 158 
Total$5,864 $5,516 $5,030