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Investments (Tables)
 6 Months Ended
Jun. 30, 2020
Investments [Abstract]  
Current and Long-Term Investments, Available-For-Sale
A summary of current and long-term fixed maturity securities, available-for-sale, at June 30, 2020 and December 31, 2019 is as follows:
 
Cost or
Amortized
Cost
 
 
 
 
 
 
 
 
 
Non-Credit
Component of
Impairment Recognized in
Accumulated
Other
Comprehensive
Loss
 
 
Gross
Unrealized
Gains
 
Gross Unrealized Losses
 
Allowance For Credit Losses
 
Estimated
Fair Value
 
 
 
 
Less than
12 Months
 
12 Months
or Greater
 
 
 
June 30, 2020
 
 
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
$
1,250

 
$
17

 
$
(1
)
 
$
—

 
$
—

 
$
1,266

 
$
—

Government sponsored securities
96

 
7

 
(1
)
 
—

 
—

 
102

 
—

Foreign government securities
288

 
7

 
(15
)
 
—

 
(1
)
 
279

 
—

States, municipalities and political subdivisions
4,840

 
315

 
(5
)
 
—

 
—

 
5,150

 
—

Corporate securities
9,855

 
469

 
(125
)
 
(28
)
 
(23
)
 
10,148

 
(32
)
Residential mortgage-backed securities
3,696

 
137

 
(26
)
 
(11
)
 
—

 
3,796

 
—

Commercial mortgage-backed securities
80

 
2

 
(2
)
 
(4
)
 
—

 
76

 
—

Other securities
1,744

 
20

 
(34
)
 
(9
)
 
—

 
1,721

 
—

Total fixed maturity securities
$
21,849

 
$
974

 
$
(209
)
 
$
(52
)
 
$
(24
)
 
$
22,538

 
$
(32
)
December 31, 2019
 
 
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
$
524

 
$
4

 
$
(3
)
 
$
—

 
$
—

 
$
525

 
$
—

Government sponsored securities
136

 
5

 
—

 
—

 
—

 
141

 
—

States, municipalities and political subdivisions
4,592

 
262

 
(3
)
 
—

 
—

 
4,851

 
—

Corporate securities
8,870

 
339

 
(9
)
 
(15
)
 
—

 
9,185

 
(3
)
Residential mortgage-backed securities
3,654

 
87

 
(6
)
 
(3
)
 
—

 
3,732

 
—

Commercial mortgage-backed securities
84

 
2

 
—

 
—

 
—

 
86

 
—

Other securities
1,648

 
21

 
(3
)
 
(5
)
 
—

 
1,661

 
—

Total fixed maturity securities
$
19,508

 
$
720

 
$
(24
)
 
$
(23
)
 
$
—

 
$
20,181

 
$
(3
)
Aggregate Fair Value and Gross Unrealized Loss of Fixed Maturity Securities in an Unrealized Loss Position
For fixed maturity securities in an unrealized loss position at June 30, 2020 and December 31, 2019, the following table summarizes the aggregate fair values and gross unrealized losses by length of time those securities have continuously been in an unrealized loss position: 
 
Less than 12 Months
 
12 Months or Greater
(Securities are whole amounts)
Number of
Securities
 
Estimated
Fair Value
 
Gross
Unrealized
Loss
 
Number of
Securities
 
Estimated
Fair Value
 
Gross
Unrealized
Loss
June 30, 2020
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
5

 
$
832

 
$
(1
)
 
—

 
$
—

 
$
—

Government sponsored securities
1

 
1

 
(1
)
 
1

 
—

 
—

Foreign government securities
219

 
161

 
(15
)
 
—

 
—

 
—

States, municipalities and political subdivisions
111

 
221

 
(5
)
 
3

 
5

 
—

Corporate securities
1,813

 
2,297

 
(125
)
 
185

 
211

 
(28
)
Residential mortgage-backed securities
375

 
654

 
(26
)
 
78

 
117

 
(11
)
Commercial mortgage-backed securities
7

 
17

 
(2
)
 
3

 
3

 
(4
)
Other securities
381

 
924

 
(34
)
 
65

 
161

 
(9
)
Total fixed maturity securities
2,912

 
$
5,107

 
$
(209
)
 
335

 
$
497

 
$
(52
)
December 31, 2019
 
 
 
 
 
 
 
 
 
 
 
Fixed maturity securities:
 
 
 
 
 
 
 
 
 
 
 
United States Government securities
27

 
$
250

 
$
(3
)
 
2

 
$
1

 
$
—

Government sponsored securities
14

 
12

 
—

 
3

 
1

 
—

States, municipalities and political subdivisions
114

 
306

 
(3
)
 
14

 
11

 
—

Corporate securities
386

 
558

 
(9
)
 
224

 
286

 
(15
)
Residential mortgage-backed securities
321

 
635

 
(6
)
 
189

 
237

 
(3
)
Commercial mortgage-backed securities
1

 
3

 
—

 
4

 
8

 
—

Other securities
166

 
415

 
(3
)
 
113

 
358

 
(5
)
Total fixed maturity securities
1,029

 
$
2,179

 
$
(24
)
 
549

 
$
902

 
$
(23
)
Fixed Maturity Securities, Available-for-sale, Allowance for Credit Loss
The table below presents a roll-forward by major security type of the allowance for credit losses on fixed maturity securities available-for-sale held at period end for the three months ended June 30, 2020:
Three Months Ended June 30
 
Corporate Securities
 
Foreign Government Securities
 
Total
Allowance for credit losses:
 
 
 
 
 
 
 
Beginning balance
 
$
51

 
$
—

 
$
51

 
Additions for securities for which no previous expected credit losses were recognized
 
9

 
1

 
10

 
Securities sold during the period
 
(8
)
 
—

 
(8
)
 
Increases (decreases) to the allowance for credit losses on securities
 
(29
)
 
—

 
(29
)
Total allowance for credit losses
 
$
23

 
$
1

 
$
24

The table below presents a roll-forward by major security type of the allowance for credit losses on fixed maturity securities available-for-sale held at period end for the six months ended June 30, 2020:
Six Months Ended June 30
 
Corporate Securities
 
Foreign Government Securities
 
Total
Allowance for credit losses:
 
 
 
 
 
 
 
Beginning balance
 
$
—

 
$
—

 
$
—

 
Additions for securities for which no previous expected credit losses were recognized
 
60

 
1

 
61

 
Securities sold during the period
 
(8
)
 
—

 
(8
)
 
Increases (decreases) to the allowance for credit losses on securities
 
(29
)
 
—

 
(29
)
Total allowance for credit losses
 
$
23

 
$
1

 
$
24
Amortized Cost and Fair Value of Fixed Maturity Securities, By Contractual Maturity
The amortized cost and fair value of fixed maturity securities at June 30, 2020, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations.
 
Amortized
Cost
 
Estimated
Fair Value
Due in one year or less
$
1,481

 
$
1,484

Due after one year through five years
5,736

 
5,876

Due after five years through ten years
6,121

 
6,340

Due after ten years
4,735

 
4,966

Mortgage-backed securities
3,776

 
3,872

Total fixed maturity securities
$
21,849

 
$
22,538
Proceeds and Realized Gains and Losses from Fixed Maturity Securities
Proceeds from sales, maturities, calls or redemptions of fixed maturity securities and the related gross realized gains and gross realized losses for the three and six months ended June 30, 2020 and 2019 are as follows:
 
Three Months Ended 
 June 30
 
Six Months Ended 
 June 30
 
2020
 
2019
 
2020
 
2019
Proceeds
$
2,618

 
$
1,986

 
$
4,549

 
$
3,454

Gross realized gains
37

 
22

 
80

 
40

Gross realized losses
(50
)
 
(17
)
 
(70
)
 
(34
)
Investments In Equity Securities
A summary of marketable equity securities at June 30, 2020 and December 31, 2019 is as follows:
 
June 30, 2020
 
December 31, 2019
Equity securities:
 
 
 
Exchange traded funds
$
3,224

 
$
44

Fixed maturity mutual funds
152

 
643

Common equity securities
32

 
237

Private equity securities
62

 
85

Total
$
3,470

 
$
1,009
Gains (Losses) Related to Equity Securities
The gains and losses related to equity securities for the three and six months ended June 30, 2020 and 2019 are as follows:
 
Three Months Ended June 30
 
Six Months Ended June 30
 
2020
 
2019
 
2020
 
2019
Net realized gains (losses) recognized on equity securities
$
45

 
$
13

 
$
(5
)
 
$
92

Less: Net realized losses (gains) recognized on equity securities sold during the period
13

 
(29
)
 
(5
)
 
(50
)
Unrealized gains (losses) recognized on equity securities still held at June 30
$
58

 
$
(16
)
 
$
(10
)
 
$
42
Securities Lending Programs
The remaining contractual maturity of our securities lending agreements at June 30, 2020 is as follows:
 
Overnight and Continuous
Securities lending collateral
 
Cash
$
961

United States Government securities
151

Other securities
2

Total
$
1,114