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INVESTMENT SECURITIES (Tables)
 12 Months Ended
Dec. 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 December 31, 2019 and 2018, respectively:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
December 31, 2019
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
353

 
$
1

 
$
—

 
$
354

Mortgage-backed securities
3,628

 
85

 
(3
)
 
3,710

Tax-exempt municipal securities
1,433

 
30

 
—

 
1,463

Mortgage-backed securities:
 
 
 
 
 
 
 
Commercial
786

 
18

 
—

 
804

Asset-backed securities
1,093

 
3

 
(3
)
 
1,093

Corporate debt securities
3,867

 
82

 
(2
)
 
3,947

Total debt securities
$
11,160

 
$
219

 
$
(8
)
 
$
11,371

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 December 31, 2019 and 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)
 
December 31, 2019
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
48

 
$
—

 
$
23

 
$
—

 
$
71

 
$
—

 
Mortgage-backed securities
315

 
(1
)
 
204

 
(2
)
 
519

 
(3
)
 
Tax-exempt municipal securities
58

 
—

 
75

 
—

 
133

 
—

 
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
Commercial
118

 
—

 
36

 
—

 
154

 
—

 
Asset-backed securities
20

 
—

 
607

 
(3
)
 
627

 
(3
)
 
Corporate debt securities
589

 
(2
)
 
155

 
—

 
744

 
(2
)
 
Total debt securities
$
1,148

 
$
(3
)
 
$
1,100

 
$
(5
)
 
$
2,248

 
$
(8
)
 
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 years ended December 31, 2019, 2018, and 2017:
 
2019
 
2018
 
2017
 
(in millions)
Gross realized gains
$
129

 
$
106

 
$
35

Gross realized losses
(67
)
 
(16
)
 
(21
)
Net realized capital gains
$
62

 
$
90

 
$
14
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at December 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
$
1,316

 
$
1,317

Due after one year through five years
1,974

 
2,013

Due after five years through ten years
1,724

 
1,780

Due after ten years
639

 
654

Mortgage and asset-backed securities
5,507

 
5,607

Total debt securities
$
11,160

 
$
11,371