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INVESTMENT SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investment Securities Classified as Current and Long-Term
Investment securities classified as current and long-term were as follows at June 30, 2015 and December 31, 2014, respectively:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
June 30, 2015
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
336

 
$
1

 
$
—

 
$
337

Mortgage-backed securities
1,345

 
34

 
(17
)
 
1,362

Tax-exempt municipal securities
2,563

 
92

 
(14
)
 
2,641

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
14

 
—

 
—

 
14

Commercial
965

 
9

 
(30
)
 
944

Asset-backed securities
162

 
1

 
—

 
163

Corporate debt securities
3,239

 
211

 
(31
)
 
3,419

Total debt securities
$
8,624

 
$
348

 
$
(92
)
 
$
8,880

December 31, 2014
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
365

 
$
10

 
$
(1
)
 
$
374

Mortgage-backed securities
1,453

 
50

 
(5
)
 
1,498

Tax-exempt municipal securities
2,931

 
140

 
(3
)
 
3,068

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
17

 
—

 
—

 
17

Commercial
846

 
16

 
(19
)
 
843

Asset-backed securities
28

 
1

 
—

 
29

Corporate debt securities
3,432

 
299

 
(13
)
 
3,718

Total debt securities
$
9,072

 
$
516

 
$
(41
)
 
$
9,547
Schedule of Gross Unrealized Losses and Fair Value of Securities
Gross unrealized losses and fair values aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows at June 30, 2015 and December 31, 2014, respectively:
 
Less than 12 months
 
12 months or more
 
Total
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
(in millions)
June 30, 2015
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
86

 
$
—

 
$
19

 
$
—

 
$
105

 
$
—

Mortgage-backed
securities
710

 
(14
)
 
91

 
(3
)
 
801

 
(17
)
Tax-exempt municipal
securities
685

 
(12
)
 
38

 
(2
)
 
723

 
(14
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
—

 
—

 
5

 
—

 
5

 
—

Commercial
383

 
(8
)
 
271

 
(22
)
 
654

 
(30
)
Asset-backed securities
149

 
—

 
—

 
—

 
149

 
—

Corporate debt securities
708

 
(28
)
 
38

 
(3
)
 
746

 
(31
)
Total debt securities
$
2,721

 
$
(62
)
 
$
462

 
$
(30
)
 
$
3,183

 
$
(92
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
79

 
$
—

 
$
80

 
$
(1
)
 
$
159

 
$
(1
)
Mortgage-backed
securities
22

 
—

 
320

 
(5
)
 
342

 
(5
)
Tax-exempt municipal
securities
131

 
(1
)
 
118

 
(2
)
 
249

 
(3
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
1

 
—

 
4

 
—

 
5

 
—

Commercial
31

 
(1
)
 
267

 
(18
)
 
298

 
(19
)
Asset-backed securities
13

 
—

 
—

 
—

 
13

 
—

Corporate debt securities
219

 
(6
)
 
128

 
(7
)
 
347

 
(13
)
Total debt securities
$
496

 
$
(8
)
 
$
917

 
$
(33
)
 
$
1,413

 
$
(41
)
Schedule of Realized Gains (Losses) Related to Investment Securities Included Within Investment Income
The detail of realized gains (losses) related to investment securities and included within investment income was as follows for the three and six months ended June 30, 2015 and 2014:
 
Three months ended
June 30,
 
Six months ended
June 30,
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Gross realized gains
$
30

 
$
6

 
$
47

 
$
7

Gross realized losses
(2
)
 
(4
)
 
(10
)
 
(4
)
Net realized capital gains
$
28

 
$
2


$
37


$
3
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at June 30, 2015, regardless of their balance sheet classification, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
 
Amortized
Cost
 
Fair
Value
 
(in millions)
Due within one year
$
454

 
$
456

Due after one year through five years
1,859

 
1,953

Due after five years through ten years
1,805

 
1,861

Due after ten years
2,020

 
2,127

Mortgage and asset-backed securities
2,486

 
2,483

Total debt securities
$
8,624

 
$
8,880