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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Sep. 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 September 30, 2016 and December 31, 2015, respectively:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
September 30, 2016
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
659

 
$
2

 
$
—

 
$
661

Mortgage-backed securities
1,512

 
24

 
(1
)
 
1,535

Tax-exempt municipal securities
3,157

 
73

 
(4
)
 
3,226

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
10

 
—

 
—

 
10

Commercial
498

 
13

 
(8
)
 
503

Asset-backed securities
187

 
1

 
—

 
188

Corporate debt securities
3,223

 
268

 
(12
)
 
3,479

Total debt securities
$
9,246

 
$
381

 
$
(25
)
 
$
9,602

 
 
 
 
 
 
 
 
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 September 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)
September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
190

 
$
—

 
$
3

 
$
—

 
$
193

 
$
—

Mortgage-backed
securities
67

 
—

 
3

 
(1
)
 
70

 
(1
)
Tax-exempt municipal
securities
1,069

 
(4
)
 
24

 
—

 
1,093

 
(4
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
—

 
—

 
5

 
—

 
5

 
—

Commercial
35

 
—

 
81

 
(8
)
 
116

 
(8
)
Asset-backed securities
35

 
—

 
68

 
—

 
103

 
—

Corporate debt securities
536

 
(6
)
 
81

 
(6
)
 
617

 
(12
)
Total debt securities
$
1,932

 
$
(10
)
 
$
265

 
$
(15
)
 
$
2,197

 
$
(25
)
 
 
 
 
 
 
 
 
 
 
 
 
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 nine months ended September 30, 2016 and 2015:
 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2016
 
2015
 
2016
 
2015
 
(in millions)
Gross realized gains
$
37

 
$
62

 
$
88

 
$
108

Gross realized losses
(11
)
 
(11
)
 
(23
)
 
(20
)
Net realized capital gains
$
26

 
$
51


$
65


$
88
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at September 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
$
611

 
$
610

Due after one year through five years
2,152

 
2,200

Due after five years through ten years
1,647

 
1,698

Due after ten years
2,629

 
2,858

Mortgage and asset-backed securities
2,207

 
2,236

Total debt securities
$
9,246

 
$
9,602