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Investments (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities, and Equity Method Investments [Abstract]    
Schedule of Available-for-sale Securities
The carrying amounts and fair values of our available for sale securities at March 31, 2018 and December 31, 2017 are as follows:
 
March 31, 2018
 
Carrying
 
Cost
 
Unrealized
 
Unrealized
 
Fair
 
Value
 
Basis
 
Gains
 
Losses
 
Value
 
(In millions)
Fixed maturity securities available for sale:
 
 
 
 
 
 
 
 
 
U.S. government and agencies
$
245

 
$
247

 
$
—

 
$
(2
)
 
$
245

State and political subdivisions
230

 
227

 
3

 
—

 
230

Corporate debt securities
1,196

 
1,201

 
6

 
(11
)
 
1,196

Mortgage-backed/asset-backed securities
53

 
53

 
1

 
(1
)
 
53

Foreign government bonds
58

 
60

 
—

 
(2
)
 
58

Total
$
1,782

 
$
1,788

 
$
10

 
$
(16
)
 
$
1,782


 
December 31, 2017
 
Carrying
 
Cost
 
Unrealized
 
Unrealized
 
Fair
 
Value
 
Basis
 
Gains
 
Losses
 
Value
 
(In millions)
Fixed maturity securities available for sale:
 
 
 
 
 
 
 
 
 
U.S. government and agencies
$
195

 
$
196

 
$
—

 
$
(1
)
 
$
195

State and political subdivisions
391

 
387

 
4

 
—

 
391

Corporate debt securities
1,117

 
1,110

 
11

 
(4
)
 
1,117

Mortgage-backed/asset-backed securities
56

 
55

 
1

 
—

 
56

Foreign government bonds
57

 
58

 
1

 
(2
)
 
57

Preferred securities
319

 
307

 
12

 
—

 
319

Equity securities
681

 
517

 
172

 
(8
)
 
681

Total
$
2,816

 
$
2,630

 
$
201

 
$
(15
)
 
$
2,816
The carrying amounts and fair values of our available for sale securities at December 31, 2017 and 2016 are as follows:
 
December 31, 2017
 
Carrying
Value
 
Cost Basis
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
Fixed maturity investments available for sale:
 

 
 

 
 

 
 

 
 

U.S. government and agencies
$
195

 
$
196

 
$
—

 
$
(1
)
 
$
195

States and political subdivisions
391

 
387

 
4

 
—

 
391

Corporate debt securities
1,117

 
1,110

 
11

 
(4
)
 
1,117

Foreign government bonds
57

 
58

 
1

 
(2
)
 
57

Mortgage-backed/asset-backed securities
56

 
55

 
1

 
—

 
56

Preferred stock available for sale
319

 
307

 
12

 
—

 
319

Equity securities available for sale
681

 
517

 
172

 
(8
)
 
681

  Total
$
2,816

 
$
2,630

 
$
201

 
$
(15
)
 
$
2,816

 
 
December 31, 2016
 
Carrying
Value
 
Cost Basis
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
Fixed maturity investments available for sale:
 

 
 

 
 

 
 

 
 

U.S. government and agencies
$
117

 
$
117

 
$
—

 
$
—

 
$
117

States and political subdivisions
615

 
607

 
9

 
(1
)
 
615

Corporate debt securities
1,508

 
1,499

 
15

 
(6
)
 
1,508

Foreign government bonds
109

 
117

 
—

 
(8
)
 
109

Mortgage-backed/asset-backed securities
58

 
56

 
2

 
—

 
58

Preferred stock available for sale
315

 
312

 
6

 
(3
)
 
315

Equity securities available for sale
386

 
278

 
108

 
—

 
386

  Total
$
3,108

 
$
2,986

 
$
140

 
$
(18
)
 
$
3,108
Investments Classified by Contractual Maturity Date
The following table presents certain information regarding contractual maturities of our fixed maturity securities at March 31, 2018:
 
 
March 31, 2018
 
 
Amortized
 
% of
 
Fair
 
% of
Maturity
 
Cost
 
Total
 
Value
 
Total
 
 
(Dollars in millions)
One year or less
 
$
445

 
25
%
 
$
444

 
25
%
After one year through five years
 
1,269

 
71

 
1,264

 
71

After five years through ten years
 
16

 
1

 
16

 
1

After ten years
 
5

 
—

 
5

 
—

Mortgage-backed/asset-backed securities
 
53

 
3

 
53

 
3

Total
 
$
1,788

 
100
%
 
$
1,782

 
100
%
The following table presents certain information regarding contractual maturities of our fixed maturity securities at December 31, 2017:
 
December 31, 2017
Maturity
Amortized Cost
 
% of
Total
 
Fair
Value
 
% of
Total
 
(Dollars in millions)
One year or less
$
496

 
27.5
%
 
$
496

 
27.3
%
After one year through five years
1,219

 
67.5

 
1,227

 
67.5

After five years through ten years
31

 
1.7

 
32

 
1.8

After ten years
5

 
0.3

 
5

 
0.3

Mortgage-backed/asset-backed securities
55

 
3.0

 
56

 
3.1

 
$
1,806

 
100.0
%
 
$
1,816

 
100.0
%
Schedule of Temporary Impairment Losses, Investments
Net unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2018 and December 31, 2017, were as follows (in millions):
March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
Less than 12 Months
 
12 Months or Longer
 
Total
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Value
 
Losses
 
Value
 
Losses
 
Value
 
Losses
U.S. government and agencies
$
210

 
$
(2
)
 
$
—

 
$
—

 
$
210

 
$
(2
)
Corporate debt securities
830

 
(8
)
 
44

 
(3
)
 
874

 
(11
)
Foreign government bonds
19

 
(1
)
 
7

 
(1
)
 
26

 
(2
)
Mortgage-backed/asset-backed securities
29

 
(1
)
 
—

 
—

 
29

 
(1
)
Total temporarily impaired securities
$
1,088

 
$
(12
)
 
$
51

 
$
(4
)
 
$
1,139

 
$
(16
)

December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
Less than 12 Months
 
12 Months or Longer
 
Total
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Value
 
Losses
 
Value
 
Losses
 
Value
 
Losses
U.S. government and agencies
$
149

 
$
(1
)
 
$
—

 
$
—

 
$
149

 
$
(1
)
Corporate debt securities
464

 
(3
)
 
51

 
(1
)
 
515

 
(4
)
Foreign government bonds
—

 
—

 
10

 
(2
)
 
10

 
(2
)
Equity securities
121

 
(7
)
 
5

 
(1
)
 
126

 
(8
)
Total temporarily impaired securities
$
734

 
$
(11
)
 
$
66

 
$
(4
)
 
$
800

 
$
(15
)
Net unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2017 and 2016 are as follows (in millions):
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
Less than 12 Months
 
12 Months or Longer
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Corporate debt securities
$
464

 
$
(3
)
 
$
51

 
$
(1
)
 
$
515

 
$
(4
)
U.S. government and agencies
149

 
(1
)
 
—

 
—

 
149

 
(1
)
Foreign government bonds
—

 
—

 
10

 
(2
)
 
10

 
(2
)
Equity securities available for sale
121

 
(7
)
 
5

 
(1
)
 
126

 
(8
)
Total temporarily impaired securities
$
734

 
$
(11
)
 
$
66

 
$
(4
)
 
$
800

 
$
(15
)

December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
Less than 12 Months
 
12 Months or Longer
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
States and political subdivisions
$
107

 
$
(1
)
 
$
—

 
$
—

 
$
107

 
$
(1
)
Corporate debt securities
410

 
(4
)
 
11

 
(2
)
 
421

 
(6
)
Foreign government bonds
85

 
(4
)
 
20

 
(4
)
 
105

 
(8
)
Preferred stock available for sale
55

 
(2
)
 
42

 
(1
)
 
97

 
(3
)
Total temporarily impaired securities
$
657

 
$
(11
)
 
$
73

 
$
(7
)
 
$
730

 
$
(18
)
Realized Gains and Losses and Proceeds From Sales on Investments and Other Assets
The following table presents realized gains and losses on investments and other assets and proceeds from the sale or maturity of investments and other assets for the three-month periods ended March 31, 2018 and 2017, respectively:
 
 
Three months ended March 31, 2018
 
 
Gross Realized Gains
 
Gross Realized Losses
 
Net Realized Gains (Losses)
 
Gross Proceeds from Sale/Maturity
 
 
(In millions)
Fixed maturity securities available for sale
 
$
3

 
$
—

 
$
3

 
$
298

Valuation losses on equity securities
 
 
 
 
 
(4
)
 
—

Valuation losses on preferred securities
 
 
 
 
 
(3
)
 
—

Property and equipment
 
 
 
 
 
5

 
21

Total
 
 
 
 
 
$
1

 
$
319


 
 
Three months ended March 31, 2017
 
 
Gross Realized Gains
 
Gross Realized Losses
 
Net Realized Gains (Losses)
 
Gross Proceeds from Sale/Maturity
 
 
(In millions)
Fixed maturity securities available for sale
 
$
3

 
$
(3
)
 
$
—

 
$
236

Loss on debt redemptions
 
 
 
 
 
(2
)
 
—

Other assets
 
 
 
 
 
(2
)
 
—

Total
 
 
 
 
 
$
(4
)
 
$
236
The following table presents realized gains and losses on investments and other assets and proceeds from the sale or maturity of investments and other assets for the years ended December 31, 2017, 2016, and 2015, respectively:
 
 
Year ended December 31, 2017
 
 
Gross Realized Gains
 
Gross Realized Losses
 
Net Realized Gains (Losses)
 
Gross Proceeds from Sale/Maturity
 
 
(In millions)
Fixed maturity securities available for sale
 
$
7

 
$
(8
)
 
$
(1
)
 
$
968

Preferred stock available for sale
 
—

 
—

 
—

 
10

Other long-term investments
 
 
 
 
 
9

 
21

Loss on debt conversions
 
 
 
 
 
(6
)
 
—

Property, plant and equipment
 
 
 
 
 
2

 
4

Other intangible assets
 
 
 
 
 
(1
)
 
—

Other realized gains and losses, net
 
 
 
 
 
(1
)
 
—

Total
 
 
 
 
 
$
2

 
$
1,003

 
 
 
 
 
 
 
 
 
 
 
Year ended December 31, 2016
 
 
Gross Realized Gains
 
Gross Realized Losses
 
Net Realized Gains (Losses)
 
Gross Proceeds from Sale/Maturity
 
 
(In millions)
Fixed maturity securities available for sale
 
$
4

 
$
(16
)
 
$
(12
)
 
$
624

Preferred stock available for sale
 
1

 
—

 
1

 
9

Equity securities available for sale
 
11

 
(1
)
 
10

 
50

Investments in unconsolidated affiliates
 
 
 
 
 
(3
)
 
—

Other intangible assets
 
 
 
 
 
(1
)
 
—

Other assets
 
 
 
 
 
(3
)
 
6

Total
 
 
 
 
 
$
(8
)
 
$
689

 
 
 
 
 
 
 
 
 
 
 
Year ended December 31, 2015
 
 
Gross Realized Gains
 
Gross Realized Losses
 
Net Realized Gains (Losses)
 
Gross Proceeds from Sale/Maturity
 
 
(In millions)
Fixed maturity securities available for sale
 
$
14

 
$
(17
)
 
$
(3
)
 
$
1,076

Preferred stock available for sale
 
1

 
—

 
1

 
58

Equity securities available for sale
 
13

 
(11
)
 
2

 
51

Other assets
 
 
 
 
 
11

 
—

Total
 
 
 
 
 
$
11

 
$
1,185

 
 
 
 
 
 
 
 
 
Interest and Investment Income  
Interest and investment income consists of the following:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In millions)
Cash and cash equivalents
$
3

 
$
—

 
$
—

Fixed maturity securities available for sale
61

 
76

 
82

Equity securities and preferred stock available for sale
28

 
28

 
24

Short-term investments
4

 
2

 
—

Other
35

 
20

 
15

Total
$
131

 
$
126

 
$
121