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INVESTMENT SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2014
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 December 31, 2014 and 2013, respectively:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
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

December 31, 2013
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
584

 
$
6

 
$
(6
)
 
$
584

Mortgage-backed securities
1,834

 
34

 
(48
)
 
1,820

Tax-exempt municipal securities
2,911

 
93

 
(33
)
 
2,971

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
22

 
—

 
—

 
22

Commercial
662

 
20

 
(9
)
 
673

Asset-backed securities
63

 
1

 
(1
)
 
63

Corporate debt securities
3,474

 
223

 
(30
)
 
3,667

Total debt securities
$
9,550

 
$
377

 
$
(127
)
 
$
9,800
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 December 31, 2014 and 2013, 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)
 
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
)
 
December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
231

 
$
(6
)
 
$
5

 
$
—

 
$
236

 
$
(6
)
 
Mortgage-backed securities
1,076

 
(47
)
 
21

 
(1
)
 
1,097

 
(48
)
 
Tax-exempt municipal securities
693

 
(28
)
 
57

 
(5
)
 
750

 
(33
)
 
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
Residential
6

 
—

 
1

 
—

 
7

 
—

 
Commercial
270

 
(8
)
 
40

 
(1
)
 
310

 
(9
)
 
Asset-backed securities
35

 
(1
)
 
—

 
—

 
35

 
(1
)
 
Corporate debt securities
594

 
(28
)
 
17

 
(2
)
 
611

 
(30
)
 
Total debt securities
$
2,905

 
$
(118
)
 
$
141

 
$
(9
)
 
$
3,046

 
$
(127
)
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 years ended December 31, 2014, 2013, and 2012:
 
2014
 
2013
 
2012
 
(in millions)
Gross realized gains
$
29

 
$
33

 
$
38

Gross realized losses
(9
)
 
(11
)
 
(5
)
Net realized capital gains
$
20

 
$
22

 
$
33
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at December 31, 2014, 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
$
530

 
$
534

Due after one year through five years
2,060

 
2,164

Due after five years through ten years
2,036

 
2,145

Due after ten years
2,102

 
2,317

Mortgage and asset-backed securities
2,344

 
2,387

Total debt securities
$
9,072

 
$
9,547