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Investments (Tables)
 6 Months Ended
Jan. 28, 2017
Investments, Debt and Equity Securities [Abstract]  
Summary Of Available-For-Sale Investments
The following tables summarize the Company’s available-for-sale investments (in millions):
January 28, 2017
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
22,910

 
$
4

 
$
(82
)
 
$
22,832

U.S. government agency securities
2,401

 
1

 
(5
)
 
2,397

Non-U.S. government and agency securities
1,211

 
—

 
(6
)
 
1,205

Corporate debt securities
30,878

 
85

 
(265
)
 
30,698

U.S. agency mortgage-backed securities
2,031

 
2

 
(27
)
 
2,006

Commercial paper
195

 
—

 
—

 
195

Total fixed income securities
59,626

 
92

 
(385
)
 
59,333

Publicly traded equity securities
1,225

 
463

 
(74
)
 
1,614

Total (1)
$
60,851

 
$
555

 
$
(459
)
 
$
60,947


July 30, 2016
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
26,473

 
$
73

 
$
(2
)
 
$
26,544

U.S. government agency securities
2,809

 
8

 
—

 
2,817

Non-U.S. government and agency securities
1,096

 
4

 
—

 
1,100

Corporate debt securities
24,044

 
263

 
(15
)
 
24,292

U.S. agency mortgage-backed securities
1,846

 
22

 
—

 
1,868

Total fixed income securities
56,268

 
370

 
(17
)
 
56,621

Publicly traded equity securities
1,211

 
333

 
(40
)
 
1,504

Total (1)
$
57,479

 
$
703

 
$
(57
)
 
$
58,125

(1) Includes investments that were pending settlement as of the respective fiscal years. The net unsettled investment purchases were $6 million and $654 million as of January 28, 2017 and July 30, 2016, respectively.
Gross Realized Gains And Gross Realized Losses Related To Available-For-Sale Investment
The following table presents the gross realized gains and gross realized losses related to the Company’s available-for-sale investments (in millions):
 
Three Months Ended
 
Six Months Ended
 
January 28, 2017
 
January 23, 2016
 
January 28, 2017
 
January 23, 2016
Gross realized gains
$
18

 
$
16

 
$
48

 
$
51

Gross realized losses
(48
)
 
(35
)
 
(63
)
 
(71
)
Total
$
(30
)
 
$
(19
)
 
$
(15
)
 
$
(20
)



The following table presents the realized net gains (losses) related to the Company’s available-for-sale investments by security type (in millions):
 
Three Months Ended
 
Six Months Ended
 
January 28, 2017
 
January 23, 2016
 
January 28, 2017
 
January 23, 2016
Net gains (losses) on investments in publicly traded equity securities
$
4

 
$
2

 
$
9

 
$
(7
)
Net gains (losses) on investments in fixed income securities
(34
)
 
(21
)
 
(24
)
 
(13
)
Total
$
(30
)
 
$
(19
)
 
$
(15
)
 
$
(20
)
Available-For-Sale Investments With Gross Unrealized Losses
The following tables present the breakdown of the available-for-sale investments with gross unrealized losses and the duration that those losses had been unrealized at January 28, 2017 and July 30, 2016 (in millions):
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
January 28, 2017
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
16,303

 
$
(82
)
 
$
16

 
$
—

 
$
16,319

 
$
(82
)
U.S. government agency securities
1,430

 
(5
)
 
—

 
—

 
1,430

 
(5
)
Non-U.S. government and agency securities
1,107

 
(6
)
 
6

 
—

 
1,113

 
(6
)
Corporate debt securities
15,180

 
(264
)
 
325

 
(1
)
 
15,505

 
(265
)
U.S. agency mortgage-backed securities
1,780

 
(27
)
 
—

 
—

 
1,780

 
(27
)
Total fixed income securities
35,800

 
(384
)

347


(1
)

36,147


(385
)
Publicly traded equity securities
63

 
(6
)
 
94

 
(68
)
 
157

 
(74
)
Total
$
35,863

 
$
(390
)
 
$
441

 
$
(69
)
 
$
36,304

 
$
(459
)
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
July 30, 2016
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
2,414

 
$
(2
)
 
$
—

 
$
—

 
$
2,414

 
$
(2
)
U.S. government agency securities
144

 
—

 
—

 
—

 
144

 
—

Non-U.S. government and agency securities
61

 
—

 
—

 
—

 
61

 
—

Corporate debt securities
2,499

 
(7
)
 
1,208

 
(8
)
 
3,707

 
(15
)
U.S. agency mortgage-backed securities
174

 
—

 
—

 
—

 
174

 
—

Total fixed income securities
5,292

 
(9
)
 
1,208

 
(8
)
 
6,500

 
(17
)
Publicly traded equity securities
188

 
(40
)
 
—

 
—

 
188

 
(40
)
Total
$
5,480

 
$
(49
)
 
$
1,208

 
$
(8
)
 
$
6,688

 
$
(57
)
Maturities of Fixed Income Securities
The following table summarizes the maturities of the Company’s fixed income securities as of January 28, 2017 (in millions): 
 
Amortized Cost
 
Fair Value
Less than 1 year
$
12,678

 
$
12,681

Due in 1 to 2 years
16,678

 
16,667

Due in 2 to 5 years
24,535

 
24,407

Due after 5 years
3,704

 
3,572

Mortgage-backed securities with no single maturity
2,031

 
2,006

Total
$
59,626

 
$
59,333
Equity Method and Cost Method Investments
For such investments that were accounted for under the equity and cost method as of January 28, 2017 and July 30, 2016, the amounts are summarized in the following table (in millions):
 
January 28, 2017
 
July 30, 2016
Equity method investments
$
176

 
$
174

Cost method investments
831

 
829

Total
$
1,007

 
$
1,003