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Investments (Tables)
 9 Months Ended
Sep. 30, 2016
Short-Term and Long-Term Investments [Table Text Block]
A summary of short-term and long-term investments by major security type is as follows:
(in millions)
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
September 30, 2016
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
2,301

 
$
12

 
$
(2
)
 
$
2,311

State and municipal obligations
 
7,207

 
213

 
(3
)
 
7,417

Corporate obligations
 
10,292

 
176

 
(6
)
 
10,462

U.S. agency mortgage-backed securities
 
2,571

 
42

 
(1
)
 
2,612

Non-U.S. agency mortgage-backed securities
 
931

 
24

 
(3
)
 
952

Total debt securities - available-for-sale
 
23,302

 
467

 
(15
)
 
23,754

Equity securities - available-for-sale
 
1,919

 
58

 
(41
)
 
1,936

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
174

 
2

 
—

 
176

State and municipal obligations
 
8

 
—

 
—

 
8

Corporate obligations
 
323

 
—

 
—

 
323

Total debt securities - held-to-maturity
 
505

 
2

 
—

 
507

Total investments
 
$
25,726

 
$
527

 
$
(56
)
 
$
26,197

December 31, 2015
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
1,982

 
$
1

 
$
(6
)
 
$
1,977

State and municipal obligations
 
6,022

 
149

 
(3
)
 
6,168

Corporate obligations
 
7,446

 
41

 
(81
)
 
7,406

U.S. agency mortgage-backed securities
 
2,127

 
13

 
(16
)
 
2,124

Non-U.S. agency mortgage-backed securities
 
962

 
5

 
(11
)
 
956

Total debt securities - available-for-sale
 
18,539

 
209

 
(117
)
 
18,631

Equity securities - available-for-sale
 
1,638

 
58

 
(57
)
 
1,639

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
163

 
1

 
—

 
164

State and municipal obligations
 
8

 
—

 
—

 
8

Corporate obligations
 
339

 
—

 
—

 
339

Total debt securities - held-to-maturity
 
510

 
1

 
—

 
511

Total investments
 
$
20,687

 
$
268

 
$
(174
)
 
$
20,781
Investments by Contractual Maturity [Table Text Block]
The amortized cost and fair value of debt securities as of September 30, 2016, by contractual maturity, were as follows:
 
 
Available-for-Sale
 
Held-to-Maturity
(in millions)
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
Due in one year or less
 
$
2,971

 
$
2,975

 
$
141

 
$
141

Due after one year through five years
 
9,024

 
9,132

 
168

 
169

Due after five years through ten years
 
5,543

 
5,735

 
103

 
103

Due after ten years
 
2,262

 
2,348

 
93

 
94

U.S. agency mortgage-backed securities
 
2,571

 
2,612

 
—

 
—

Non-U.S. agency mortgage-backed securities
 
931

 
952

 
—

 
—

Total debt securities
 
$
23,302

 
$
23,754

 
$
505

 
$
507
Fair Value of Available-for-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time that Individual Securities have been in a Continuous Unrealized Loss Position [Table Text Block]
The fair value of available-for-sale investments with gross unrealized losses by major security type and length of time that individual securities have been in a continuous unrealized loss position were as follows:
 
 
Less Than 12 Months
 
12 Months or Greater
 
 Total
(in millions)
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
705

 
$
(2
)
 
$
—

 
$
—

 
$
705

 
$
(2
)
State and municipal obligations
 
1,007

 
(3
)
 
—

 
—

 
1,007

 
(3
)
Corporate obligations
 
1,285

 
(3
)
 
271

 
(3
)
 
1,556

 
(6
)
U.S. agency mortgage-backed securities
 
—

 
—

 
86

 
(1
)
 
86

 
(1
)
Non-U.S. agency mortgage-backed securities
 
—

 
—

 
114

 
(3
)
 
114

 
(3
)
Total debt securities - available-for-sale
 
$
2,997

 
$
(8
)
 
$
471

 
$
(7
)
 
$
3,468

 
$
(15
)
Equity securities - available-for-sale
 
$
83

 
$
(4
)
 
$
109

 
$
(37
)
 
$
192

 
$
(41
)
December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
1,473

 
$
(6
)
 
$
—

 
$
—

 
$
1,473

 
$
(6
)
State and municipal obligations
 
650

 
(3
)
 
—

 
—

 
650

 
(3
)
Corporate obligations
 
4,629

 
(63
)
 
339

 
(18
)
 
4,968

 
(81
)
U.S. agency mortgage-backed securities
 
1,304

 
(12
)
 
116

 
(4
)
 
1,420

 
(16
)
Non-U.S. agency mortgage-backed securities
 
593

 
(7
)
 
127

 
(4
)
 
720

 
(11
)
Total debt securities - available-for-sale
 
$
8,649

 
$
(91
)
 
$
582

 
$
(26
)
 
$
9,231

 
$
(117
)
Equity securities - available-for-sale
 
$
112

 
$
(11
)
 
$
89

 
$
(46
)
 
$
201

 
$
(57
)
Net Realized Gains, Included in Investment and Other Income [Table Text Block]
Net realized gains reclassified out of accumulated other comprehensive income were from the following sources:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions)
 
2016
 
2015
 
2016
 
2015
Total other than temporary impairments recognized in earnings
 
$
(21
)
 
$
(4
)
 
$
(43
)
 
$
(8
)
Gross realized losses from sales
 
(3
)
 
(9
)
 
(38
)
 
(20
)
Gross realized gains from sales
 
50

 
41

 
178

 
127

Net realized gains (included in investment and other income on the Condensed Consolidated Statements of Operations)
 
26

 
28

 
97

 
99

Income tax effect (included in provision for income taxes on the Condensed Consolidated Statements of Operations)
 
(9
)
 
(11
)
 
(35
)
 
(37
)
Realized gains, net of taxes
 
$
17

 
$
17

 
$
62

 
$
62