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INVESTMENT SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2018
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 June 30, 2018 and December 31, 2017, respectively:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
June 30, 2018
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
631

 
$
—

 
$
(4
)
 
$
627

Mortgage-backed securities
2,327

 
—

 
(69
)
 
2,258

Tax-exempt municipal securities
3,045

 
3

 
(49
)
 
2,999

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
17

 
—

 
—

 
17

Commercial
533

 
—

 
(16
)
 
517

Asset-backed securities
574

 
1

 
(2
)
 
573

Corporate debt securities
2,946

 
2

 
(96
)
 
2,852

Total debt securities
$
10,073

 
$
6

 
$
(236
)
 
$
9,843

 
 
 
 
 
 
 
 
December 31, 2017
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
532

 
$
1

 
$
(2
)
 
$
531

Mortgage-backed securities
1,625

 
4

 
(19
)
 
1,610

Tax-exempt municipal securities
3,884

 
33

 
(28
)
 
3,889

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
26

 
—

 
—

 
26

Commercial
455

 
3

 
(2
)
 
456

Asset-backed securities
407

 
1

 
—

 
408

Corporate debt securities
5,175

 
244

 
(37
)
 
5,382

Total debt securities
$
12,104

 
$
286

 
$
(88
)
 
$
12,302
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 June 30, 2018 and December 31, 2017, 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)
June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
437

 
$
(2
)
 
$
114

 
$
(2
)
 
$
551

 
$
(4
)
Mortgage-backed
securities
1,596

 
(40
)
 
583

 
(29
)
 
2,179

 
(69
)
Tax-exempt municipal
securities
2,245

 
(34
)
 
456

 
(15
)
 
2,701

 
(49
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
16

 
—

 
1

 
—

 
17

 
—

Commercial
457

 
(14
)
 
27

 
(2
)
 
484

 
(16
)
Asset-backed securities
334

 
(2
)
 
4

 
—

 
338

 
(2
)
Corporate debt securities
2,037

 
(62
)
 
533

 
(34
)
 
2,570

 
(96
)
Total debt securities
$
7,122

 
$
(154
)
 
$
1,718

 
$
(82
)
 
$
8,840

 
$
(236
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
273

 
$
(1
)
 
$
130

 
$
(1
)
 
$
403

 
$
(2
)
Mortgage-backed
securities
581

 
(2
)
 
672

 
(17
)
 
1,253

 
(19
)
Tax-exempt municipal
securities
1,590

 
(16
)
 
661

 
(12
)
 
2,251

 
(28
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
20

 
—

 
3

 
—

 
23

 
—

Commercial
131

 
(1
)
 
28

 
(1
)
 
159

 
(2
)
Asset-backed securities
107

 
—

 
10

 
—

 
117

 
—

Corporate debt securities
1,297

 
(10
)
 
804

 
(27
)
 
2,101

 
(37
)
Total debt securities
$
3,999

 
$
(30
)
 
$
2,308

 
$
(58
)
 
$
6,307

 
$
(88
)
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 six months ended June 30, 2018 and 2017:
 
Three months ended
June 30,
 
Six months ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Gross realized gains
$
63

 
$
4

 
$
94

 
$
31

Gross realized losses
(10
)
 
(2
)
 
(12
)
 
(3
)
Net realized capital gains
$
53

 
$
2


$
82


$
28
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at June 30, 2018, 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
$
722

 
$
720

Due after one year through five years
3,016

 
2,964

Due after five years through ten years
2,100

 
2,022

Due after ten years
784

 
772

Mortgage and asset-backed securities
3,451

 
3,365

Total debt securities
$
10,073

 
$
9,843