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INVESTMENT SECURITIES (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2018 and December 31, 2017, respectively:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
March 31, 2018
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
505

 
$
1

 
$
(5
)
 
$
501

Mortgage-backed securities
2,308

 
—

 
(56
)
 
2,252

Tax-exempt municipal securities
3,549

 
6

 
(61
)
 
3,494

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
24

 
—

 
(1
)
 
23

Commercial
580

 
—

 
(11
)
 
569

Asset-backed securities
554

 
1

 
(1
)
 
554

Corporate debt securities
4,693

 
131

 
(114
)
 
4,710

Total debt securities
$
12,213

 
$
139

 
$
(249
)
 
$
12,103

 
 
 
 
 
 
 
 
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 March 31, 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)
March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S.
government corporations
and agencies:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
obligations
$
362

 
$
(2
)
 
$
129

 
$
(3
)
 
$
491

 
$
(5
)
Mortgage-backed
securities
1,489

 
(28
)
 
638

 
(28
)
 
2,127

 
(56
)
Tax-exempt municipal
securities
2,409

 
(41
)
 
621

 
(20
)
 
3,030

 
(61
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Residential
18

 
—

 
3

 
(1
)
 
21

 
(1
)
Commercial
451

 
(10
)
 
28

 
(1
)
 
479

 
(11
)
Asset-backed securities
162

 
(1
)
 
7

 
—

 
169

 
(1
)
Corporate debt securities
2,431

 
(60
)
 
761

 
(54
)
 
3,192

 
(114
)
Total debt securities
$
7,322

 
$
(142
)
 
$
2,187

 
$
(107
)
 
$
9,509

 
$
(249
)
 
 
 
 
 
 
 
 
 
 
 
 
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 months ended March 31, 2018 and 2017:
 
Three months ended
March 31,
 
2018
 
2017
 
(in millions)
Gross realized gains
$
32

 
$
27

Gross realized losses
(3
)
 
(1
)
Net realized capital gains
$
29


$
26
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at March 31, 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
$
856

 
$
854

Due after one year through five years
2,846

 
2,803

Due after five years through ten years
2,317

 
2,247

Due after ten years
2,728

 
2,801

Mortgage and asset-backed securities
3,466

 
3,398

Total debt securities
$
12,213

 
$
12,103