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Marketable Securities
 3 Months Ended
Apr. 29, 2018
Notes to financial statements [Abstract]  
Marketable Securities
Marketable Securities 
All of our cash equivalents and marketable securities are classified as “available-for-sale” debt securities.
The following is a summary of cash equivalents and marketable securities as of April 29, 2018 and January 28, 2018:
 
April 29, 2018
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
Reported as
 
 
 
 
 
Cash Equivalents
 
Marketable Securities
 
(In millions)
Debt securities issued by the United States Treasury
$
2,741

 
$
—

 
$
(4
)
 
$
2,737

 
$
100

 
$
2,637

Corporate debt securities
1,803

 
—

 
(11
)
 
1,792

 
—

 
1,792

Debt securities of United States government agencies
1,734

 
—

 
(7
)
 
1,727

 
—

 
1,727

Money market funds
460

 
—

 
—

 
460

 
460

 
—

Asset-backed securities
230

 
—

 
(3
)
 
227

 
—

 
227

Mortgage-backed securities issued by United States government-sponsored enterprises
119

 
2

 
—

 
121

 
—

 
121

Foreign government bonds
31

 
—

 
—

 
31

 
—

 
31

Total
$
7,118

 
$
2

 
$
(25
)
 
$
7,095

 
$
560

 
$
6,535

 
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


The following table provides the breakdown of unrealized losses as of April 29, 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
 
Estimated Fair Value
 
Gross
Unrealized
Losses
 
Estimated Fair Value
 
Gross
Unrealized
Losses
 
Estimated Fair Value
 
Gross
Unrealized
Losses
 
(In millions)
Debt securities issued by the United States Treasury
$
1,539

 
$
—

 
$
502

 
$
(4
)
 
$
2,041

 
$
(4
)
Debt securities issued by United States government agencies
1,039

 
(1
)
 
687

 
(6
)
 
1,726

 
(7
)
Corporate debt securities
253

 
(2
)
 
835

 
(9
)
 
1,088

 
(11
)
Asset-backed securities
56

 
(1
)
 
172

 
(2
)
 
228

 
(3
)
 
$
2,887

 
$
(4
)
 
$
2,196

 
$
(21
)
 
$
5,083

 
$
(25
)

The gross unrealized losses related to fixed income securities 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 the first quarter of fiscal years 2019 and 2018, 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 April 29, 2018 and January 28, 2018 are shown below by contractual maturity.  
 
April 29, 2018
 
January 28, 2018
 
Amortized
Cost
 
Estimated
Fair Value
 
Amortized
Cost
 
Estimated
Fair Value
 
(In millions)
Less than 1 year
$
5,490

 
$
5,481

 
$
5,381

 
$
5,375

Due in 1 - 5 years
1,593

 
1,578

 
1,500

 
1,485

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

 
36

 
35

 
35

Total
$
7,118

 
$
7,095

 
$
6,916

 
$
6,895