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Investments (Tables)
 3 Months Ended
Mar. 31, 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
March 31, 2016
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
2,318

 
$
13

 
$
(1
)
 
$
2,330

State and municipal obligations
 
6,233

 
180

 
(2
)
 
6,411

Corporate obligations
 
8,751

 
110

 
(30
)
 
8,831

U.S. agency mortgage-backed securities
 
2,488

 
28

 
(3
)
 
2,513

Non-U.S. agency mortgage-backed securities
 
958

 
17

 
(4
)
 
971

Total debt securities - available-for-sale
 
20,748

 
348

 
(40
)
 
21,056

Equity securities - available-for-sale
 
1,739

 
63

 
(53
)
 
1,749

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
175

 
3

 
—

 
178

State and municipal obligations
 
7

 
—

 
—

 
7

Corporate obligations
 
326

 
—

 
—

 
326

Total debt securities - held-to-maturity
 
508

 
3

 
—

 
511

Total investments
 
$
22,995

 
$
414

 
$
(93
)
 
$
23,316

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
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
March 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
507

 
$
(1
)
 
$
—

 
$
—

 
$
507

 
$
(1
)
State and municipal obligations
 
488

 
(2
)
 
—

 
—

 
488

 
(2
)
Corporate obligations
 
2,107

 
(22
)
 
337

 
(8
)
 
2,444

 
(30
)
U.S. agency mortgage-backed securities
 
—

 
—

 
214

 
(3
)
 
214

 
(3
)
Non-U.S. agency mortgage-backed securities
 
203

 
(1
)
 
145

 
(3
)
 
348

 
(4
)
Total debt securities - available-for-sale
 
$
3,305

 
$
(26
)
 
$
696

 
$
(14
)
 
$
4,001

 
$
(40
)
Equity securities - available-for-sale
 
$
98

 
$
(8
)
 
$
94

 
$
(45
)
 
$
192

 
$
(53
)
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 March 31,
(in millions)
 
2016
 
2015
Total other than temporary impairments recognized in earnings
 
$
(21
)
 
$
(1
)
Gross realized losses from sales
 
(31
)
 
(6
)
Gross realized gains from sales
 
87

 
10

Net realized gains (included in investment and other income on the Condensed Consolidated Statements of Operations)
 
35

 
3

Income tax effect (included in provision for income taxes on the Condensed Consolidated Statements of Operations)
 
(13
)
 
(1
)
Realized gains, net of taxes
 
$
22

 
$
2
Available-for-sale Securities [Member]  
Investments by Contractual Maturity [Table Text Block]
The amortized cost and fair value of debt securities as of March 31, 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
 
$
2,534

 
$
2,539

 
$
128

 
$
128

Due after one year through five years
 
7,944

 
8,019

 
184

 
186

Due after five years through ten years
 
4,841

 
4,968

 
114

 
114

Due after ten years
 
1,983

 
2,046

 
82

 
83

U.S. agency mortgage-backed securities
 
2,488

 
2,513

 
—

 
—

Non-U.S. agency mortgage-backed securities
 
958

 
971

 
—

 
—

Total debt securities
 
$
20,748

 
$
21,056

 
$
508

 
$
511
Held-to-maturity Securities [Member]  
Investments by Contractual Maturity [Table Text Block]