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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2019
Segment Reporting [Abstract]  
Segment Information
Segment information is summarized in the following table: 
(Dollars in millions)
 
Three months ended June 30,
 
Six months ended June 30,
 
 
2019
 
2018
 
2019
 
2018
Revenues:
 
 

 
 

 
 

 
 

Commercial lines insurance
 
 

 
 

 
 

 
 

Commercial casualty
 
$
277

 
$
272

 
$
545

 
$
537

Commercial property
 
234

 
231

 
468

 
459

Commercial auto
 
175

 
166

 
345

 
327

Workers' compensation
 
74

 
85

 
151

 
165

Other commercial
 
63

 
58

 
124

 
114

Commercial lines insurance premiums
 
823

 
812

 
1,633

 
1,602

Fee revenues
 
1

 
—

 
2

 
2

Total commercial lines insurance
 
824

 
812

 
1,635

 
1,604

 
 
 
 
 
 
 
 
 
Personal lines insurance
 
 

 
 

 
 

 
 

Personal auto
 
155

 
153

 
310

 
304

Homeowner
 
149

 
139

 
296

 
275

Other personal
 
44

 
39

 
86

 
77

Personal lines insurance premiums
 
348

 
331

 
692

 
656

Fee revenues
 
1

 
2

 
2

 
3

Total personal lines insurance
 
349

 
333

 
694

 
659

 
 
 
 
 
 
 
 
 
Excess and surplus lines insurance
 
67

 
57

 
130

 
113

Fee revenues
 
—

 
1

 
1

 
1

Total excess and surplus lines insurance
 
67

 
58

 
131

 
114

 
 
 
 
 
 
 
 
 
Life insurance premiums
 
67

 
64

 
133

 
124

Fee revenues
 
1

 
1

 
2

 
2

Total life insurance
 
68

 
65

 
135

 
126

 
 
 
 
 
 
 
 
 
Investments
 
 
 
 
 
 
 
 
    Investment income, net of expenses
 
160

 
154

 
317

 
304

    Investment gains and losses, net
 
364

 
105

 
1,027

 
(86
)
Total investment revenue
 
524

 
259

 
1,344

 
218

 
 
 
 
 
 
 
 
 
Other
 
 
 
 
 
 
 
 
Earned premiums
 
79

 
30

 
129

 
59

Other
 
2

 
1

 
4

 
2

Total other revenues
 
81

 
31

 
133

 
61

Total revenues
 
$
1,913

 
$
1,558

 
$
4,072

 
$
2,782

 
 
 
 
 
 
 
 
 
Income (loss) before income taxes:
 
 

 
 

 
 

 
 

Insurance underwriting results
 
 

 
 

 
 

 
 

Commercial lines insurance
 
$
12

 
$
47

 
$
88

 
$
62

Personal lines insurance
 
5

 
(32
)
 
1

 
(41
)
Excess and surplus lines insurance
 
17

 
13

 
28

 
31

Life insurance
 
(2
)
 
8

 
(3
)
 
10

Investments
 
499

 
235

 
1,295

 
170

Other
 
(1
)
 
(7
)
 
(12
)
 
(18
)
Total income before income taxes
 
$
530

 
$
264

 
$
1,397

 
$
214

Identifiable assets:
 
June 30,
2019
 
December 31, 2018
Property casualty insurance
 
$
3,441

 
$
3,285

Life insurance
 
1,536

 
1,424

Investments
 
18,464

 
16,741

Other
 
896

 
485

Total
 
$
24,337

 
$
21,935