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Marketable Securities
 12 Months Ended
Jan. 28, 2018
Notes to financial statements [Abstract]  
Marketable Securities
Marketable Securities
All of our cash equivalents and marketable securities are classified as “available-for-sale” securities.
The following is a summary of cash equivalents and marketable securities as of January 28, 2018 and January 29, 2017:
 
January 28, 2018
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
Reported as
 
 
 
 
 
Cash Equivalents
 
Marketable Securities
 
(In millions)
Money market funds
$
3,789

 
$
—

 
$
—

 
$
3,789

 
$
3,789

 
$
—

Corporate debt securities
1,304

 
—

 
(9
)
 
1,295

 
—

 
1,295

Debt securities of United States government agencies
822

 
—

 
(7
)
 
815

 
—

 
815

Debt securities issued by the United States Treasury
577

 
—

 
(4
)
 
573

 
—

 
573

Asset-backed securities
254

 
—

 
(2
)
 
252

 
—

 
252

Mortgage-backed securities issued by United States government-sponsored enterprises
128

 
2

 
—

 
130

 
—

 
130

Foreign government bonds
42

 
—

 
(1
)
 
41

 
—

 
41

Total
$
6,916

 
$
2

 
$
(23
)
 
$
6,895

 
$
3,789

 
$
3,106

 
January 29, 2017
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
Reported as
 
 
 
 
 
Cash Equivalents
 
Marketable Securities
 
(In millions)
Corporate debt securities
$
2,397

 
$
1

 
$
(10
)
 
$
2,388

 
$
33

 
$
2,355

Debt securities of United States government agencies
1,193

 
—

 
(5
)
 
1,188

 
27

 
1,161

Debt securities issued by the United States Treasury
852

 
—

 
(2
)
 
850

 
55

 
795

Asset-backed securities
490

 
—

 
(1
)
 
489

 
—

 
489

Money market funds
321

 
—

 
—

 
321

 
321

 
—

Mortgage backed securities issued by United States government-sponsored enterprises
161

 
2

 
(1
)
 
162

 
—

 
162

Foreign government bonds
70

 
—

 
—

 
70

 
—

 
70

Total
$
5,484

 
$
3

 
$
(19
)
 
$
5,468

 
$
436

 
$
5,032


The following table provides the breakdown of unrealized losses as of January 28, 2018, aggregated by investment category and length of time that individual securities have been in a continuous loss position:
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
(In millions)
Corporate debt securities
$
433

 
$
(2
)
 
$
801

 
$
(7
)
 
$
1,234

 
$
(9
)
Debt securities issued by United States government agencies
175

 
(1
)
 
640

 
(6
)
 
815

 
(7
)
Debt securities issued by the US Treasury
170

 
(1
)
 
404

 
(3
)
 
574

 
(4
)
Asset-backed securities
73

 
—

 
179

 
(2
)
 
252

 
(2
)
Foreign government bonds
—

 
—

 
41

 
(1
)
 
41

 
(1
)
Total
$
851

 
$
(4
)
 
$
2,065

 
$
(19
)
 
$
2,916

 
$
(23
)

The gross unrealized losses related to fixed income securities and were primarily due to changes in interest rates, which we believe are temporary in nature. Currently, we have the intent and ability to hold our investments until maturity. For fiscal years 2018, 2017, and 2016, there were no other-than-temporary impairment losses and net realized gains were not significant.
The amortized cost and estimated fair value of cash equivalents and marketable securities as of January 28, 2018 and January 29, 2017 are shown below by contractual maturity.
 
January 28, 2018
 
January 29, 2017
 
Amortized
Cost
 
Estimated
Fair Value
 
Amortized
Cost
 
Estimated
Fair Value
 
(In millions)
Less than one year
$
5,381

 
$
5,375

 
$
2,209

 
$
2,209

Due in 1 - 5 years
1,500

 
1,485

 
3,210

 
3,194

Mortgage-backed securities issued by government-sponsored enterprises not due at a single maturity date
35

 
35

 
65

 
65

Total
$
6,916

 
$
6,895

 
$
5,484

 
$
5,468