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Reinsurance - Schedule IV
 12 Months Ended
Dec. 31, 2020
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,
 202020192018
Gross amounts:   
Life insurance in force$111,756 $108,130 $104,726 
Earned premiums   
Commercial lines insurance$3,578 $3,421 $3,314 
Personal lines insurance1,503 1,446 1,372 
Excess and surplus lines insurance341 292 245 
Other201 181 — 
Total property casualty insurance5,623 5,340 4,931 
Life insurance362 341 320 
Total$5,985 $5,681 $5,251 
Ceded amounts to other companies:   
Life insurance in force$38,281 $38,146 $38,584 
Earned premiums   
Commercial lines insurance$109 $109 $104 
Personal lines insurance41 43 37 
Excess and surplus lines insurance16 14 11 
Other51 39 8 
Total property casualty insurance217 205 160 
Life insurance73 71 70 
Total$290 $276 $230 
Assumed amounts from other companies:   
Life insurance in force$— $— $— 
Earned premiums   
Commercial lines insurance$7 $7 $8 
Personal lines insurance1 1 1 
Excess and surplus lines insurance— — — 
Other277 191 140 
Total property casualty insurance285 199 149 
Life insurance— — — 
Total$285 $199 $149 
Net amounts:   
Life insurance in force$73,475 $69,984 $66,142 
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 property casualty insurance5,691 5,334 4,920 
Life insurance289 270 250 
Total$5,980 $5,604 $5,170 
Percentage of amounts assumed to net:   
Life insurance in force— %— %— %
Earned premiums   
Commercial lines insurance0.2 %0.2 %0.3 %
Personal lines insurance0.1 0.1 0.1 
Excess and surplus lines insurance— — — 
Other64.9 57.4 106.1 
Total property casualty insurance5.0 3.7 3.0 
Life insurance— — — 
Total4.8 3.6 2.9