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Reinsurance - Schedule IV
 12 Months Ended
Dec. 31, 2017
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]  
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Text Block]
Schedule IV
Cincinnati Financial Corporation and Subsidiaries
Reinsurance
(Dollars in millions)
 
Years ended December 31,
 
 
2017
 
2016
 
2015
Gross amounts:
 
 

 
 

 
 

Life insurance in force
 
$
99,888

 
$
95,533

 
$
91,451

Earned premiums
 
 

 
 

 
 

Commercial lines insurance
 
$
3,258

 
$
3,180

 
$
3,088

Personal lines insurance
 
1,275

 
1,195

 
1,131

Excess and surplus lines insurance
 
219

 
192

 
177

Cincinnati Re
 
—

 
—

 
—

Total property casualty insurance
 
4,752

 
4,567

 
4,396

Life insurance
 
300

 
290

 
271

Total
 
$
5,052

 
$
4,857

 
$
4,667

 
 
 
 
 
 
 
Ceded amounts to other companies:
 
 

 
 

 
 

Life insurance in force
 
$
38,711

 
$
38,724

 
$
38,716

Earned premiums
 
 

 
 

 
 

Commercial lines insurance
 
$
99

 
$
98

 
$
102

Personal lines insurance
 
35

 
35

 
35

Excess and surplus lines insurance
 
10

 
9

 
9

Cincinnati Re
 
18

 
20

 
8

Total property casualty insurance
 
162

 
162

 
154

Life insurance
 
68

 
62

 
62

Total
 
$
230

 
$
224

 
$
216

 
 
 
 
 
 
 
Assumed amounts from other companies:
 
 

 
 

 
 

Life insurance in force
 
$
—

 
$
—

 
$
—

Earned premiums
 
 

 
 

 
 

Commercial lines insurance
 
$
6

 
$
7

 
$
10

Personal lines insurance
 
1

 
1

 
1

Excess and surplus lines insurance
 
—

 
—

 
—

Cincinnati Re
 
125

 
69

 
18

Total property casualty insurance
 
132

 
77

 
29

Life insurance
 
—

 
—

 
—

Total
 
$
132

 
$
77

 
$
29

 
 
 
 
 
 
 
Net amounts:
 
 

 
 

 
 

Life insurance in force
 
$
61,177

 
$
56,808

 
$
52,735

Earned premiums
 
 

 
 

 
 

Commercial lines insurance
 
$
3,165

 
$
3,089

 
$
2,996

Personal lines insurance
 
1,241

 
1,161

 
1,097

Excess and surplus lines insurance
 
209

 
183

 
168

Cincinnati Re
 
107

 
49

 
10

Total property casualty insurance
 
4,722

 
4,482

 
4,271

Life insurance
 
232

 
228

 
209

Total
 
$
4,954

 
$
4,710

 
$
4,480

 
 
 
 
 
 
 
Percentage of amounts assumed to net:
 
 

 
 

 
 

Life insurance in force
 
—
%
 
—
%
 
—
%
Earned premiums
 
 

 
 

 
 

Commercial lines insurance
 
0.2
%
 
0.2
%
 
0.3
%
Personal lines insurance
 
0.1

 
0.1

 
0.1

Excess and surplus lines insurance
 
—

 
—

 
—

Cincinnati Re
 
116.1

 
140.8

 
188.0

Total property casualty insurance
 
2.8

 
1.7

 
0.7

Life insurance
 
—

 
—

 
—

Total
 
2.7

 
1.6

 
0.7