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INVESTMENT SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019 and December 31, 2018, respectively:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
March 31, 2019
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
478

 
$
2

 
$
(1
)
 
$
479

Mortgage-backed securities
3,142

 
21

 
(22
)
 
3,141

Tax-exempt municipal securities
2,096

 
12

 
(5
)
 
2,103

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
84

 
1

 
—

 
85

Commercial
510

 
2

 
(3
)
 
509

Asset-backed securities
1,037

 
1

 
(6
)
 
1,032

Corporate debt securities
2,959

 
14

 
(24
)
 
2,949

Total debt securities
$
10,306

 
$
53

 
$
(61
)
 
$
10,298

 
 
 
 
 
 
 
 
December 31, 2018
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
419

 
$
1

 
$
(3
)
 
$
417

Mortgage-backed securities
2,595

 
3

 
(54
)
 
2,544

Tax-exempt municipal securities
2,805

 
3

 
(37
)
 
2,771

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
55

 
—

 
—

 
55

Commercial
537

 
—

 
(14
)
 
523

Asset-backed securities
991

 
1

 
(7
)
 
985

Corporate debt securities
3,239

 
1

 
(98
)
 
3,142

Total debt securities
$
10,641

 
$
9

 
$
(213
)
 
$
10,437
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, 2019 and December 31, 2018, 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, 2019
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
25

 
$
—

 
$
214

 
$
(1
)
 
$
239

 
$
(1
)
Mortgage-backed
securities
255

 
(1
)
 
1,152

 
(21
)
 
1,407

 
(22
)
Tax-exempt municipal
securities
30

 
—

 
924

 
(5
)
 
954

 
(5
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
—

 
—

 
15

 
—

 
15

 
—

Commercial
42

 
(1
)
 
170

 
(2
)
 
212

 
(3
)
Asset-backed securities
755

 
(5
)
 
70

 
(1
)
 
825

 
(6
)
Corporate debt securities
70

 
—

 
1,486

 
(24
)
 
1,556

 
(24
)
Total debt securities
$
1,177

 
$
(7
)
 
$
4,031

 
$
(54
)
 
$
5,208

 
$
(61
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
179

 
$
(1
)
 
$
153

 
$
(2
)
 
$
332

 
$
(3
)
Mortgage-backed
securities
956

 
(16
)
 
1,019

 
(38
)
 
1,975

 
(54
)
Tax-exempt municipal
securities
809

 
(9
)
 
1,648

 
(28
)
 
2,457

 
(37
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
—

 
—

 
15

 
—

 
15

 
—

Commercial
372

 
(8
)
 
133

 
(6
)
 
505

 
(14
)
Asset-backed securities
824

 
(7
)
 
40

 
—

 
864

 
(7
)
Corporate debt securities
1,434

 
(35
)
 
1,439

 
(63
)
 
2,873

 
(98
)
Total debt securities
$
4,574

 
$
(76
)
 
$
4,447

 
$
(137
)
 
$
9,021

 
$
(213
)
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, 2019 and 2018:
 
Three months ended
March 31,
 
2019
 
2018
 
(in millions)
Gross realized gains
$
10

 
$
32

Gross realized losses
(12
)
 
(3
)
Net realized capital (losses) gains
$
(2
)
 
$
29
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at March 31, 2019, 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
$
829

 
$
828

Due after one year through five years
2,514

 
2,511

Due after five years through ten years
1,655

 
1,652

Due after ten years
535

 
540

Mortgage and asset-backed securities
4,773

 
4,767

Total debt securities
$
10,306

 
$
10,298