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Investments (Tables)
 3 Months Ended
Mar. 31, 2014
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, 2014
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
1,851

 
$
4

 
$
(14
)
 
$
1,841

State and municipal obligations
 
6,623

 
162

 
(30
)
 
6,755

Corporate obligations
 
7,109

 
134

 
(33
)
 
7,210

U.S. agency mortgage-backed securities
 
2,261

 
20

 
(42
)
 
2,239

Non-U.S. agency mortgage-backed securities
 
818

 
13

 
(5
)
 
826

Total debt securities - available-for-sale
 
18,662

 
333

 
(124
)
 
18,871

Equity securities - available-for-sale
 
1,835

 
18

 
(15
)
 
1,838

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
182

 
2

 
—

 
184

State and municipal obligations
 
28

 
—

 
—

 
28

Corporate obligations
 
327

 
—

 
—

 
327

Total debt securities - held-to-maturity
 
537

 
2

 
—

 
539

Total investments
 
$
21,034

 
$
353

 
$
(139
)
 
$
21,248

December 31, 2013
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
2,211

 
$
5

 
$
(21
)
 
$
2,195

State and municipal obligations
 
6,902

 
147

 
(72
)
 
6,977

Corporate obligations
 
7,265

 
130

 
(60
)
 
7,335

U.S. agency mortgage-backed securities
 
2,256

 
23

 
(61
)
 
2,218

Non-U.S. agency mortgage-backed securities
 
697

 
12

 
(7
)
 
702

Total debt securities - available-for-sale
 
19,331

 
317

 
(221
)
 
19,427

Equity securities - available-for-sale
 
1,576

 
9

 
(13
)
 
1,572

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
181

 
1

 
—

 
182

State and municipal obligations
 
28

 
—

 
—

 
28

Corporate obligations
 
334

 
—

 
—

 
334

Total debt securities - held-to-maturity
 
543

 
1

 
—

 
544

Total investments
 
$
21,450

 
$
327

 
$
(234
)
 
$
21,543
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, 2014
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
796

 
$
(13
)
 
$
11

 
$
(1
)
 
$
807

 
$
(14
)
State and municipal obligations
 
1,564

 
(24
)
 
128

 
(6
)
 
1,692

 
(30
)
Corporate obligations
 
2,174

 
(26
)
 
116

 
(7
)
 
2,290

 
(33
)
U.S. agency mortgage-backed securities
 
1,146

 
(33
)
 
108

 
(9
)
 
1,254

 
(42
)
Non-U.S. agency mortgage-backed securities
 
289

 
(4
)
 
31

 
(1
)
 
320

 
(5
)
Total debt securities - available-for-sale
 
$
5,969

 
$
(100
)
 
$
394

 
$
(24
)
 
$
6,363

 
$
(124
)
Equity securities - available-for-sale
 
$
167

 
$
(15
)
 
$
—

 
$
—

 
$
167

 
$
(15
)
December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
1,055

 
$
(19
)
 
$
17

 
$
(2
)
 
$
1,072

 
$
(21
)
State and municipal obligations
 
2,491

 
(62
)
 
128

 
(10
)
 
2,619

 
(72
)
Corporate obligations
 
2,573

 
(51
)
 
103

 
(9
)
 
2,676

 
(60
)
U.S. agency mortgage-backed securities
 
1,393

 
(51
)
 
105

 
(10
)
 
1,498

 
(61
)
Non-U.S. agency mortgage-backed securities
 
289

 
(6
)
 
26

 
(1
)
 
315

 
(7
)
Total debt securities - available-for-sale
 
$
7,801

 
$
(189
)
 
$
379

 
$
(32
)
 
$
8,180

 
$
(221
)
Equity securities - available-for-sale
 
$
180

 
$
(13
)
 
$
—

 
$
—

 
$
180

 
$
(13
)
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)
 
2014
 
2013
Total OTTI
 
$
(3
)
 
$
(3
)
Portion of loss recognized in other comprehensive income
 
—

 
—

Net OTTI recognized in earnings
 
(3
)
 
(3
)
Gross realized losses from sales
 
(10
)
 
(1
)
Gross realized gains from sales
 
59

 
61

Net realized gains (included in investment and other income on the Condensed Consolidated Statements of Operations)
 
46

 
57

Income tax effect (included in provision for income taxes on the Condensed Consolidated Statements of Operations)
 
(17
)
 
(21
)
Realized gains, net of taxes
 
$
29

 
$
36
Mortgage-Backed Securities [Member]
  
Investments by Contractual Maturity [Table Text Block]
The fair values of the Company’s mortgage-backed securities by credit rating (when multiple credit ratings are available for an individual security, the average of the available ratings is used) and origination date as of March 31, 2014 were as follows:
(in millions)
 
AAA
 
AA
 
Non-Investment
Grade
 
Total Fair
Value
2014
 
$
100

 
$
—

 
$
—

 
$
100

2013
 
157

 
—

 
—

 
157

2012
 
109

 
—

 
—

 
109

2011
 
18

 
—

 
—

 
18

2010
 
25

 
—

 
—

 
25

2009
 
7

 
—

 
—

 
7

Pre - 2009
 
395

 
2

 
13

 
410

U.S. agency mortgage-backed securities
 
2,237

 
2

 
—

 
2,239

Total
 
$
3,048

 
$
4

 
$
13

 
$
3,065
Available-for-sale Securities [Member]
  
Investments by Contractual Maturity [Table Text Block]
The amortized cost and fair value of available-for-sale debt securities as of March 31, 2014, by contractual maturity, were as follows:
(in millions)
 
Amortized
Cost
 
Fair
Value
Due in one year or less
 
$
2,007

 
$
2,019

Due after one year through five years
 
6,944

 
7,052

Due after five years through ten years
 
4,900

 
4,962

Due after ten years
 
1,732

 
1,773

U.S. agency mortgage-backed securities
 
2,261

 
2,239

Non-U.S. agency mortgage-backed securities
 
818

 
826

Total debt securities - available-for-sale
 
$
18,662

 
$
18,871
Held-to-maturity Securities [Member]
  
Investments by Contractual Maturity [Table Text Block]
The amortized cost and fair value of held-to-maturity debt securities as of March 31, 2014, by contractual maturity, were as follows:
(in millions)
 
Amortized
Cost
 
Fair
Value
Due in one year or less
 
$
81

 
$
81

Due after one year through five years
 
235

 
235

Due after five years through ten years
 
132

 
134

Due after ten years
 
89

 
89

Total debt securities - held-to-maturity
 
$
537

 
$
539