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Reinsurance - Schedule IV
 12 Months Ended
Dec. 31, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]  
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Text Block]
Schedule IV
Cincinnati Financial Corporation and Subsidiaries
Reinsurance
(Dollars in millions)Years ended December 31,
 202320222021
Gross amounts:   
Life insurance in force$122,053 $120,147 $116,697 
Earned premiums   
Commercial lines insurance$4,399 $4,150 $3,777 
Personal lines insurance2,117 1,755 1,586 
Excess and surplus lines insurance572 510 417 
Other319 262 216 
Total property casualty insurance7,407 6,677 5,996 
Life insurance394 379 370 
Total$7,801 $7,056 $6,366 
Ceded amounts to other companies:   
Life insurance in force$39,692 $39,665 $39,204 
Earned premiums   
Commercial lines insurance$147 $137 $115 
Personal lines insurance74 67 45 
Excess and surplus lines insurance30 25 19 
Other80 85 76 
Total property casualty insurance331 314 255 
Life insurance81 78 76 
Total$412 $392 $331 
Assumed amounts from other companies:   
Life insurance in force$— $— $— 
Earned premiums   
Commercial lines insurance$12 $11 $12 
Personal lines insurance1 1 1 
Excess and surplus lines insurance— — — 
Other556 549 430 
Total property casualty insurance569 561 443 
Life insurance— — — 
Total$569 $561 $443 
Net amounts:   
Life insurance in force$82,361 $80,482 $77,493 
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 property casualty insurance7,645 6,924 6,184 
Life insurance313 301 294 
Total$7,958 $7,225 $6,478 
Percentage of amounts assumed to net:   
Life insurance in force— %— %— %
Earned premiums   
Commercial lines insurance0.3 %0.3 %0.3 %
Personal lines insurance— 0.1 0.1 
Excess and surplus lines insurance— — — 
Other69.9 75.6 75.4 
Total property casualty insurance7.4 8.1 7.2 
Life insurance— — — 
Total7.2 7.8 6.8