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INVESTMENT SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016 and December 31, 2015, respectively:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
June 30, 2016
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
543

 
$
2

 
$
—

 
$
545

Mortgage-backed securities
1,710

 
31

 
—

 
1,741

Tax-exempt municipal securities
2,991

 
115

 
(1
)
 
3,105

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
11

 
—

 
(1
)
 
10

Commercial
766

 
13

 
(28
)
 
751

Asset-backed securities
189

 
1

 
—

 
190

Corporate debt securities
2,879

 
260

 
(13
)
 
3,126

Total debt securities
$
9,089

 
$
422

 
$
(43
)
 
$
9,468

 
 
 
 
 
 
 
 
December 31, 2015
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
331

 
$
2

 
$
(1
)
 
$
332

Mortgage-backed securities
1,902

 
12

 
(23
)
 
1,891

Tax-exempt municipal securities
2,611

 
61

 
(4
)
 
2,668

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
13

 
—

 
—

 
13

Commercial
1,024

 
2

 
(41
)
 
985

Asset-backed securities
264

 
1

 
(2
)
 
263

Corporate debt securities
2,873

 
140

 
(55
)
 
2,958

Total debt securities
$
9,018

 
$
218

 
$
(126
)
 
$
9,110
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, 2016 and December 31, 2015, 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, 2016
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
3

 
$
—

 
$
—

 
$
—

 
$
3

 
$
—

Mortgage-backed
securities
2

 
—

 
4

 
—

 
6

 
—

Tax-exempt municipal
securities
219

 
—

 
24

 
(1
)
 
243

 
(1
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
2

 
—

 
3

 
(1
)
 
5

 
(1
)
Commercial
115

 
(2
)
 
273

 
(26
)
 
388

 
(28
)
Asset-backed securities
26

 
—

 
70

 
—

 
96

 
—

Corporate debt securities
68

 
(3
)
 
131

 
(10
)
 
199

 
(13
)
Total debt securities
$
435

 
$
(5
)
 
$
505

 
$
(38
)
 
$
940

 
$
(43
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
195

 
$
(1
)
 
$
14

 
$
—

 
$
209

 
$
(1
)
Mortgage-backed
securities
1,484

 
(20
)
 
86

 
(3
)
 
1,570

 
(23
)
Tax-exempt municipal
securities
843

 
(3
)
 
52

 
(1
)
 
895

 
(4
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
2

 
—

 
4

 
—

 
6

 
—

Commercial
626

 
(13
)
 
265

 
(28
)
 
891

 
(41
)
Asset-backed securities
258

 
(2
)
 
—

 
—

 
258

 
(2
)
Corporate debt securities
918

 
(45
)
 
63

 
(10
)
 
981

 
(55
)
Total debt securities
$
4,326

 
$
(84
)
 
$
484

 
$
(42
)
 
$
4,810

 
$
(126
)
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, 2016 and 2015:
 
Three months ended
June 30,
 
Six months ended
June 30,
 
2016
 
2015
 
2016
 
2015
 
(in millions)
Gross realized gains
$
20

 
$
30

 
$
51

 
$
47

Gross realized losses
(1
)
 
(2
)
 
(12
)
 
(10
)
Net realized capital gains
$
19

 
$
28


$
39


$
37
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at June 30, 2016, 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
$
396

 
$
395

Due after one year through five years
2,119

 
2,176

Due after five years through ten years
1,451

 
1,513

Due after ten years
2,447

 
2,692

Mortgage and asset-backed securities
2,676

 
2,692

Total debt securities
$
9,089

 
$
9,468