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Investments (Tables)
 3 Months Ended
Mar. 31, 2013
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, 2013
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
2,442

 
$
30

 
$
(1
)
 
$
2,471

State and municipal obligations
 
6,340

 
352

 
(5
)
 
6,687

Corporate obligations
 
7,325

 
254

 
(6
)
 
7,573

U.S. agency mortgage-backed securities
 
2,022

 
56

 
(4
)
 
2,074

Non-U.S. agency mortgage-backed securities
 
630

 
30

 
(1
)
 
659

Total debt securities - available-for-sale
 
18,759

 
722

 
(17
)
 
19,464

Equity securities - available-for-sale
 
720

 
8

 
(2
)
 
726

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
177

 
6

 
—

 
183

State and municipal obligations
 
28

 
—

 
—

 
28

Corporate obligations
 
622

 
—

 
—

 
622

Total debt securities - held-to-maturity
 
827

 
6

 
—

 
833

Total investments
 
$
20,306

 
$
736

 
$
(19
)
 
$
21,023

December 31, 2012
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
2,501

 
$
38

 
$
(1
)
 
$
2,538

State and municipal obligations
 
6,282

 
388

 
(3
)
 
6,667

Corporate obligations
 
6,930

 
283

 
(4
)
 
7,209

U.S. agency mortgage-backed securities
 
2,168

 
70

 
—

 
2,238

Non-U.S. agency mortgage-backed securities
 
538

 
36

 
—

 
574

Total debt securities - available-for-sale
 
18,419

 
815

 
(8
)
 
19,226

Equity securities - available-for-sale
 
668

 
10

 
(1
)
 
677

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
168

 
6

 
—

 
174

State and municipal obligations
 
30

 
—

 
—

 
30

Corporate obligations
 
641

 
2

 
—

 
643

Total debt securities - held-to-maturity
 
839

 
8

 
—

 
847

Total investments
 
$
19,926

 
$
833

 
$
(9
)
 
$
20,750
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, 2013
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
142

 
$
(1
)
 
$
—

 
$
—

 
$
142

 
$
(1
)
State and municipal obligations
 
417

 
(5
)
 
—

 
—

 
417

 
(5
)
Corporate obligations
 
1,120

 
(6
)
 
—

 
—

 
1,120

 
(6
)
U.S. agency mortgage-backed securities
 
420

 
(4
)
 
—

 
—

 
420

 
(4
)
Non-U.S. agency mortgage-backed securities
 
157

 
(1
)
 
—

 
—

 
157

 
(1
)
Total debt securities - available-for-sale
 
$
2,256

 
$
(17
)
 
$
—

 
$
—

 
$
2,256

 
$
(17
)
Equity securities - available-for-sale
 
$
40

 
$
(1
)
 
$
2

 
$
(1
)
 
$
42

 
$
(2
)
December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
183

 
$
(1
)
 
$
—

 
$
—

 
$
183

 
$
(1
)
State and municipal obligations
 
362

 
(3
)
 
—

 
—

 
362

 
(3
)
Corporate obligations
 
695

 
(4
)
 
—

 
—

 
695

 
(4
)
Total debt securities - available-for-sale
 
$
1,240

 
$
(8
)

$
—

 
$
—

 
$
1,240

 
$
(8
)
Equity securities - available-for-sale
 
$
13

 
$
(1
)
 
$
—

 
$
—

 
$
13

 
$
(1
)
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)
 
2013
 
2012
Total OTTI
 
$
(3
)
 
$
(3
)
Portion of loss recognized in other comprehensive income
 
—

 
—

Net OTTI recognized in earnings
 
(3
)
 
(3
)
Gross realized losses from sales
 
(1
)
 
(1
)
Gross realized gains from sales
 
61

 
43

Net realized gains (included in Investment and Other Income on the Condensed Consolidated Statements of Operations)
 
57

 
39

Income tax effect (included in Provision for Income Taxes on the Condensed Consolidated Statements of Operations)
 
(21
)
 
(14
)
Realized gains, net of taxes
 
$
36

 
$
25
U.S. Agency 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 as of March 31, 2013 were as follows:
(in millions)
 
AAA
 
AA
 
A
 
Non-Investment
Grade
 
Total Fair
Value
2013
 
$
59

 
$
—

 
$
—

 
$
—

 
$
59

2012
 
116

 
—

 
—

 
—

 
116

2011
 
26

 
—

 
—

 
—

 
26

2010
 
19

 
3

 
—

 
—

 
22

2009
 
1

 
—

 
—

 
—

 
1

2007
 
72

 
—

 
—

 
3

 
75

Pre - 2007
 
335

 
4

 
11

 
10

 
360

U.S. agency mortgage-backed securities
 
2,074

 
—

 
—

 
—

 
2,074

Total
 
$
2,702

 
$
7

 
$
11

 
$
13

 
$
2,733
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, 2013, by contractual maturity, were as follows:
(in millions)
 
Amortized
Cost
 
Fair
Value
Due in one year or less
 
$
3,105

 
$
3,120

Due after one year through five years
 
6,626

 
6,849

Due after five years through ten years
 
4,717

 
5,010

Due after ten years
 
1,659

 
1,752

U.S. agency mortgage-backed securities
 
2,022

 
2,074

Non-U.S. agency mortgage-backed securities
 
630

 
659

Total debt securities - available-for-sale
 
$
18,759

 
$
19,464
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, 2013, by contractual maturity, were as follows:
(in millions)
 
Amortized
Cost
 
Fair
Value
Due in one year or less
 
$
424

 
$
425

Due after one year through five years
 
148

 
150

Due after five years through ten years
 
145

 
148

Due after ten years
 
110

 
110

Total debt securities - held-to-maturity
 
$
827

 
$
833