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INVESTMENT SECURITIES (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2016 and December 31, 2015, respectively:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
March 31, 2016
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
451

 
$
2

 
$
—

 
$
453

Mortgage-backed securities
2,015

 
20

 
(1
)
 
2,034

Tax-exempt municipal securities
2,967

 
74

 
(3
)
 
3,038

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
11

 
—

 
—

 
11

Commercial
885

 
7

 
(33
)
 
859

Asset-backed securities
252

 
1

 
—

 
253

Corporate debt securities
2,870

 
187

 
(27
)
 
3,030

Total debt securities
$
9,451

 
$
291

 
$
(64
)
 
$
9,678

 
 
 
 
 
 
 
 
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 March 31, 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)
March 31, 2016
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
76

 
$
—

 
$
4

 
$
—

 
$
80

 
$
—

Mortgage-backed
securities
177

 
—

 
126

 
(1
)
 
303

 
(1
)
Tax-exempt municipal
securities
597

 
(2
)
 
42

 
(1
)
 
639

 
(3
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
2

 
—

 
3

 
—

 
5

 
—

Commercial
276

 
(6
)
 
249

 
(27
)
 
525

 
(33
)
Asset-backed securities
146

 
—

 
—

 
—

 
146

 
—

Corporate debt securities
374

 
(16
)
 
97

 
(11
)
 
471

 
(27
)
Total debt securities
$
1,648

 
$
(24
)
 
$
521

 
$
(40
)
 
$
2,169

 
$
(64
)
 
 
 
 
 
 
 
 
 
 
 
 
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 months ended March 31, 2016 and 2015:
 
Three Months Ended
March 31,
 
2016
 
2015
 
(in millions)
Gross realized gains
$
31

 
$
17

Gross realized losses
(11
)
 
(8
)
Net realized capital gains
$
20


$
9
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at March 31, 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
$
420

 
$
419

Due after one year through five years
1,961

 
2,006

Due after five years through ten years
1,432

 
1,473

Due after ten years
2,475

 
2,623

Mortgage and asset-backed securities
3,163

 
3,157

Total debt securities
$
9,451

 
$
9,678