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INVESTMENT SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015, respectively:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in millions)
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

December 31, 2015
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
331

 
$
2

 
$
(1
)
 
$
332

Mortgage-backed securities
1,902

 
12

 
(23
)
 
1,891

Tax-exempt municipal securities
2,611

 
61

 
(4
)
 
2,668

Mortgage-backed securities:
 
 
 
 
 
 
 
Residential
13

 
—

 
—

 
13

Commercial
1,024

 
2

 
(41
)
 
985

Asset-backed securities
264

 
1

 
(2
)
 
263

Corporate debt securities
2,873

 
140

 
(55
)
 
2,958

Total debt securities
$
9,018

 
$
218

 
$
(126
)
 
$
9,110
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, 2016 and 2015, 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, 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
)
 
December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and other U.S. government
corporations and agencies:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency obligations
$
195

 
$
(1
)
 
$
14

 
$
—

 
$
209

 
$
(1
)
 
Mortgage-backed securities
1,484

 
(20
)
 
86

 
(3
)
 
1,570

 
(23
)
 
Tax-exempt municipal securities
843

 
(3
)
 
52

 
(1
)
 
895

 
(4
)
 
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
Residential
2

 
—

 
4

 
—

 
6

 
—

 
Commercial
626

 
(13
)
 
265

 
(28
)
 
891

 
(41
)
 
Asset-backed securities
258

 
(2
)
 
—

 
—

 
258

 
(2
)
 
Corporate debt securities
918

 
(45
)
 
63

 
(10
)
 
981

 
(55
)
 
Total debt securities
$
4,326

 
$
(84
)
 
$
484

 
$
(42
)
 
$
4,810

 
$
(126
)
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, 2016, 2015, and 2014:
 
2016
 
2015
 
2014
 
(in millions)
Gross realized gains
$
120

 
$
179

 
$
29

Gross realized losses
(24
)
 
(33
)
 
(9
)
Net realized capital gains
$
96

 
$
146

 
$
20
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at December 31, 2016, 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
$
635

 
$
635

Due after one year through five years
2,424

 
2,426

Due after five years through ten years
1,938

 
1,893

Due after ten years
2,691

 
2,734

Mortgage and asset-backed securities
2,138

 
2,110

Total debt securities
$
9,826

 
$
9,798