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INVESTMENT SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 and December 31, 2016, respectively:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
March 31, 2017
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
833

 
$
—

 
$
(12
)
 
$
821

Mortgage-backed securities
1,645

 
4

 
(31
)
 
1,618

Tax-exempt municipal securities
3,408

 
9

 
(48
)
 
3,369

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
8

 
—

 
—

 
8

Commercial
412

 
1

 
(4
)
 
409

Asset-backed securities
132

 
—

 
—

 
132

Corporate debt securities
4,198

 
144

 
(70
)
 
4,272

Total debt securities
$
10,636

 
$
158

 
$
(165
)
 
$
10,629

 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
800

 
$
1

 
$
(15
)
 
$
786

Mortgage-backed securities
1,662

 
6

 
(31
)
 
1,637

Tax-exempt municipal securities
3,358

 
15

 
(68
)
 
3,305

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
9

 
—

 
—

 
9

Commercial
307

 
1

 
(4
)
 
304

Asset-backed securities
160

 
—

 
—

 
160

Corporate debt securities
3,530

 
145

 
(78
)
 
3,597

Total debt securities
$
9,826

 
$
168

 
$
(196
)
 
$
9,798
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, 2017 and December 31, 2016, 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, 2017
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
705

 
$
(12
)
 
$
3

 
$
—

 
$
708

 
$
(12
)
Mortgage-backed
securities
1,565

 
(31
)
 
3

 
—

 
1,568

 
(31
)
Tax-exempt municipal
securities
2,493

 
(47
)
 
25

 
(1
)
 
2,518

 
(48
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
—

 
—

 
4

 
—

 
4

 
—

Commercial
190

 
(3
)
 
8

 
(1
)
 
198

 
(4
)
Asset-backed securities
65

 
—

 
52

 
—

 
117

 
—

Corporate debt securities
1,710

 
(65
)
 
70

 
(5
)
 
1,780

 
(70
)
Total debt securities
$
6,728

 
$
(158
)
 
$
165

 
$
(7
)
 
$
6,893

 
$
(165
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
697

 
$
(15
)
 
$
3

 
$
—

 
$
700

 
$
(15
)
Mortgage-backed
securities
1,528

 
(31
)
 
3

 
—

 
1,531

 
(31
)
Tax-exempt municipal
securities
2,756

 
(67
)
 
43

 
(1
)
 
2,799

 
(68
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
—

 
—

 
4

 
—

 
4

 
—

Commercial
182

 
(3
)
 
24

 
(1
)
 
206

 
(4
)
Asset-backed securities
51

 
—

 
63

 
—

 
114

 
—

Corporate debt securities
1,544

 
(71
)
 
69

 
(7
)
 
1,613

 
(78
)
Total debt securities
$
6,758

 
$
(187
)
 
$
209

 
$
(9
)
 
$
6,967

 
$
(196
)
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, 2017 and 2016:
 
Three months ended
March 31,
 
2017
 
2016
 
(in millions)
Gross realized gains
$
27

 
$
31

Gross realized losses
(1
)
 
(11
)
Net realized capital gains
$
26


$
20
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at March 31, 2017, 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
$
561

 
$
562

Due after one year through five years
2,764

 
2,770

Due after five years through ten years
2,188

 
2,153

Due after ten years
2,926

 
2,977

Mortgage and asset-backed securities
2,197

 
2,167

Total debt securities
$
10,636

 
$
10,629