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Marketable Securities (Tables)
9 Months Ended
Oct. 29, 2017
Schedule of Available-for-sale Securities [Line Items]  
Cash Equivalents and Marketable Securities
 
October 29, 2017
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
Reported as
 
 
 
 
 
Cash Equivalents
 
Marketable Securities
 
(In millions)
Corporate debt securities
$
1,515

 
$

 
$
(5
)
 
$
1,510

 
$

 
$
1,510

Debt securities of United States government agencies
907

 

 
(5
)
 
902

 

 
902

Debt securities issued by the United States Treasury
638

 

 
(3
)
 
635

 

 
635

Asset-backed securities
289

 

 
(1
)
 
288

 

 
288

Mortgage-backed securities issued by United States government-sponsored enterprises
140

 
2

 
(1
)
 
141

 

 
141

Foreign government bonds
42

 

 

 
42

 

 
42

Money market funds
2,609

 

 

 
2,609

 
2,609

 

Total
$
6,140

 
$
2

 
$
(15
)
 
$
6,127

 
$
2,609

 
$
3,518

 
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

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

 
2

 
(1
)
 
162

 

 
162

Foreign government bonds
70

 

 

 
70

 

 
70

Money market funds
321

 

 

 
321

 
321

 

Total
$
5,484

 
$
3

 
$
(19
)
 
$
5,468

 
$
436

 
$
5,032

Schedule of Unrealized Loss on Investments
 
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)
Corporate debt securities
$
867

 
$
(3
)
 
$
407

 
$
(2
)
 
$
1,274

 
$
(5
)
Debt securities issued by United States government agencies
666

 
(3
)
 
236

 
(2
)
 
902

 
(5
)
Debt securities issued by the United States Treasury
509

 
(2
)
 
126

 
(1
)
 
635

 
(3
)
Asset-backed securities
233

 
(1
)
 
44

 

 
277

 
(1
)
Mortgage-backed securities issued by United States government-sponsored enterprises
26

 

 
36

 
(1
)
 
62

 
(1
)
 
$
2,301

 
$
(9
)
 
$
849

 
$
(6
)
 
$
3,150

 
$
(15
)
Schedule of Amortization Cost and Estimated FV of CE and MS
 
October 29, 2017
 
January 29, 2017
 
Amortized
Cost
 
Estimated
Fair Value
 
Amortized
Cost
 
Estimated
Fair Value
 
(In millions)
Less than 1 year
$
4,074

 
$
4,072

 
$
2,209

 
$
2,209

Due in 1 - 5 years
2,024

 
2,013

 
3,210

 
3,194

Mortgage-backed securities issued by United States government-sponsored enterprises not due at a single maturity date
42

 
42

 
65

 
65

Total
$
6,140

 
$
6,127

 
$
5,484

 
$
5,468