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Investments (Tables)
 3 Months Ended
Mar. 31, 2015
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, 2015
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
1,663

 
$
19

 
$
—

 
$
1,682

State and municipal obligations
 
6,464

 
232

 
(3
)
 
6,693

Corporate obligations
 
7,668

 
158

 
(10
)
 
7,816

U.S. agency mortgage-backed securities
 
2,011

 
48

 
(3
)
 
2,056

Non-U.S. agency mortgage-backed securities
 
858

 
16

 
(2
)
 
872

Total debt securities - available-for-sale
 
18,664

 
473

 
(18
)
 
19,119

Equity securities - available-for-sale
 
1,526

 
37

 
(33
)
 
1,530

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
178

 
4

 
—

 
182

State and municipal obligations
 
15

 
—

 
—

 
15

Corporate obligations
 
354

 
—

 
—

 
354

Total debt securities - held-to-maturity
 
547

 
4

 
—

 
551

Total investments
 
$
20,737

 
$
514

 
$
(51
)
 
$
21,200

December 31, 2014
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
1,614

 
$
7

 
$
(1
)
 
$
1,620

State and municipal obligations
 
6,456

 
217

 
(5
)
 
6,668

Corporate obligations
 
7,241

 
112

 
(26
)
 
7,327

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

 
39

 
(5
)
 
2,056

Non-U.S. agency mortgage-backed securities
 
872

 
12

 
(4
)
 
880

Total debt securities - available-for-sale
 
18,205

 
387

 
(41
)
 
18,551

Equity securities - available-for-sale
 
1,511

 
36

 
(25
)
 
1,522

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
178

 
2

 
—

 
180

State and municipal obligations
 
19

 
—

 
—

 
19

Corporate obligations
 
298

 
—

 
—

 
298

Total debt securities - held-to-maturity
 
495

 
2

 
—

 
497

Total investments
 
$
20,211

 
$
425

 
$
(66
)
 
$
20,570
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, 2015
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
State and municipal obligations
 
$
481

 
$
(2
)
 
$
27

 
$
(1
)
 
$
508

 
$
(3
)
Corporate obligations
 
1,509

 
(7
)
 
235

 
(3
)
 
1,744

 
(10
)
U.S. agency mortgage-backed securities
 
151

 
(1
)
 
133

 
(2
)
 
284

 
(3
)
Non-U.S. agency mortgage-backed securities
 
186

 
(2
)
 
—

 
—

 
186

 
(2
)
Total debt securities - available-for-sale
 
$
2,327

 
$
(12
)
 
$
395

 
$
(6
)
 
$
2,722

 
$
(18
)
Equity securities - available-for-sale
 
$
76

 
$
(7
)
 
$
83

 
$
(26
)
 
$
159

 
$
(33
)
December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
420

 
$
(1
)
 
$
—

 
$
—

 
$
420

 
$
(1
)
State and municipal obligations
 
711

 
(4
)
 
99

 
(1
)
 
810

 
(5
)
Corporate obligations
 
2,595

 
(17
)
 
464

 
(9
)
 
3,059

 
(26
)
U.S. agency mortgage-backed securities
 
—

 
—

 
272

 
(5
)
 
272

 
(5
)
Non-U.S. agency mortgage-backed securities
 
254

 
(2
)
 
114

 
(2
)
 
368

 
(4
)
Total debt securities - available-for-sale
 
$
3,980

 
$
(24
)
 
$
949

 
$
(17
)
 
$
4,929

 
$
(41
)
Equity securities - available-for-sale
 
$
107

 
$
(6
)
 
$
88

 
$
(19
)
 
$
195

 
$
(25
)
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)
 
2015
 
2014
Total OTTI
 
$
(1
)
 
$
(3
)
Portion of loss recognized in other comprehensive income
 
—

 
—

Net OTTI recognized in earnings
 
(1
)
 
(3
)
Gross realized losses from sales
 
(6
)
 
(10
)
Gross realized gains from sales
 
10

 
59

Net realized gains (included in investment and other income on the Condensed Consolidated Statements of Operations)
 
3

 
46

Income tax effect (included in provision for income taxes on the Condensed Consolidated Statements of Operations)
 
(1
)
 
(17
)
Realized gains, net of taxes
 
$
2

 
$
29
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, 2015, by contractual maturity, were as follows:
(in millions)
 
Amortized
Cost
 
Fair
Value
Due in one year or less
 
$
1,856

 
$
1,862

Due after one year through five years
 
6,927

 
7,035

Due after five years through ten years
 
5,205

 
5,387

Due after ten years
 
1,807

 
1,907

U.S. agency mortgage-backed securities
 
2,011

 
2,056

Non-U.S. agency mortgage-backed securities
 
858

 
872

Total debt securities - available-for-sale
 
$
18,664

 
$
19,119
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, 2015, by contractual maturity, were as follows:
(in millions)
 
Amortized
Cost
 
Fair
Value
Due in one year or less
 
$
127

 
$
127

Due after one year through five years
 
207

 
209

Due after five years through ten years
 
109

 
110

Due after ten years
 
104

 
105

Total debt securities - held-to-maturity
 
$
547

 
$
551