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Investments (Tables)
 9 Months Ended
Sep. 30, 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
September 30, 2015
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
1,890

 
$
14

 
$
—

 
$
1,904

State and municipal obligations
 
5,993

 
155

 
(6
)
 
6,142

Corporate obligations
 
7,441

 
77

 
(47
)
 
7,471

U.S. agency mortgage-backed securities
 
2,026

 
27

 
(6
)
 
2,047

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

 
11

 
(4
)
 
879

Total debt securities - available-for-sale
 
18,222

 
284

 
(63
)
 
18,443

Equity securities - available-for-sale
 
1,526

 
44

 
(58
)
 
1,512

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
162

 
2

 
—

 
164

State and municipal obligations
 
15

 
—

 
—

 
15

Corporate obligations
 
345

 
—

 
—

 
345

Total debt securities - held-to-maturity
 
522

 
2

 
—

 
524

Total investments
 
$
20,270

 
$
330

 
$
(121
)
 
$
20,479

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
September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
State and municipal obligations
 
$
507

 
$
(5
)
 
$
17

 
$
(1
)
 
$
524

 
$
(6
)
Corporate obligations
 
2,799

 
(39
)
 
270

 
(8
)
 
3,069

 
(47
)
U.S. agency mortgage-backed securities
 
365

 
(3
)
 
122

 
(3
)
 
487

 
(6
)
Non-U.S. agency mortgage-backed securities
 
317

 
(3
)
 
93

 
(1
)
 
410

 
(4
)
Total debt securities - available-for-sale
 
$
3,988

 
$
(50
)
 
$
502

 
$
(13
)
 
$
4,490

 
$
(63
)
Equity securities - available-for-sale
 
$
140

 
$
(16
)
 
$
82

 
$
(42
)
 
$
222

 
$
(58
)
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 September 30,
 
Nine Months Ended September 30,
(in millions)
 
2015
 
2014
 
2015
 
2014
Total OTTI
 
$
(4
)
 
$
(18
)
 
$
(8
)
 
$
(25
)
Portion of loss recognized in other comprehensive income
 
—

 
—

 
—

 
—

Net OTTI recognized in earnings
 
(4
)
 
(18
)
 
(8
)

(25
)
Gross realized losses from sales
 
(9
)
 
(3
)
 
(20
)
 
(42
)
Gross realized gains from sales
 
41

 
51

 
127

 
250

Net realized gains (included in investment and other income on the Condensed Consolidated Statements of Operations)
 
28

 
30

 
99

 
183

Income tax effect (included in provision for income taxes on the Condensed Consolidated Statements of Operations)
 
(11
)
 
(11
)
 
(37
)
 
(67
)
Realized gains, net of taxes
 
$
17

 
$
19

 
$
62

 
$
116
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 September 30, 2015, by contractual maturity, were as follows:
(in millions)
 
Amortized
Cost
 
Fair
Value
Due in one year or less
 
$
2,047

 
$
2,051

Due after one year through five years
 
6,830

 
6,901

Due after five years through ten years
 
4,720

 
4,793

Due after ten years
 
1,727

 
1,772

U.S. agency mortgage-backed securities
 
2,026

 
2,047

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

 
879

Total debt securities - available-for-sale
 
$
18,222

 
$
18,443
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 September 30, 2015, by contractual maturity, were as follows:
(in millions)
 
Amortized
Cost
 
Fair
Value
Due in one year or less
 
$
121

 
$
121

Due after one year through five years
 
203

 
204

Due after five years through ten years
 
84

 
84

Due after ten years
 
114

 
115

Total debt securities - held-to-maturity
 
$
522

 
$
524