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Marketable Securities (Tables)
 9 Months Ended
Oct. 27, 2019
Investments, Debt and Equity Securities [Abstract]  
Cash Equivalents and Marketable Securities
The following is a summary of cash equivalents and marketable securities as of October 27, 2019 and January 27, 2019:
 
October 27, 2019
 
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
$
5,883

 
$
—

 
$
—

 
$
5,883

 
$
5,883

 
$
—

Corporate debt securities
1,293

 
—

 
—

 
1,293

 
1,293

 
—

Debt securities of United States government agencies
1,204

 
—

 
—

 
1,204

 
1,204

 
—

Money market funds
1,070

 
—

 
—

 
1,070

 
1,070

 
—

Foreign government debt securities
178

 
—

 
—

 
178

 
178

 
—

Certificates of deposit
25

 
—

 
—

 
25

 
25

 
—

Asset-backed securities
4

 
—

 
—

 
4

 
—

 
4

Total
$
9,657

 
$
—

 
$
—

 
$
9,657

 
$
9,653

 
$
4

 
January 27, 2019
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
Reported as
 
 
 
 
 
Cash Equivalents
 
Marketable Securities
 
(In millions)
Corporate debt securities
$
2,626

 
$
—

 
$
(6
)
 
$
2,620

 
$
25

 
$
2,595

Debt securities of United States government agencies
2,284

 
—

 
(4
)
 
2,280

 
—

 
2,280

Debt securities issued by the United States Treasury
1,493

 
—

 
(1
)
 
1,492

 
176

 
1,316

Money market funds
483

 
—

 
—

 
483

 
483

 
—

Foreign government debt securities
209

 
—

 
—

 
209

 
—

 
209

Asset-backed securities
152

 
—

 
(1
)
 
151

 
—

 
151

Mortgage-backed securities issued by United States government-sponsored enterprises
88

 
1

 
—

 
89

 
—

 
89

Total
$
7,335

 
$
1

 
$
(12
)
 
$
7,324

 
$
684

 
$
6,640


The amortized cost and estimated fair value of cash equivalents and marketable securities as of October 27, 2019 and January 27, 2019 are shown below by contractual maturity.  
 
October 27, 2019
 
January 27, 2019
 
Amortized
Cost
 
Estimated
Fair Value
 
Amortized
Cost
 
Estimated
Fair Value
 
(In millions)
Less than 1 year
$
9,657

 
$
9,657

 
$
5,042

 
$
5,034

Due in 1 - 5 years
—

 
—

 
2,271

 
2,268

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

 
—

 
22

 
22

Total
$
9,657

 
$
9,657

 
$
7,335

 
$
7,324