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Investments (Tables)
 9 Months Ended
Apr. 29, 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):
April 29, 2017
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
20,951

 
$
4

 
$
(67
)
 
$
20,888

U.S. government agency securities
2,233

 
—

 
(6
)
 
2,227

Non-U.S. government and agency securities
721

 
—

 
(2
)
 
719

Corporate debt securities
31,649

 
145

 
(160
)
 
31,634

U.S. agency mortgage-backed securities
2,038

 
3

 
(18
)
 
2,023

Commercial paper
635

 
—

 
—

 
635

Certificates of deposit
26

 
—

 
—

 
26

Total fixed income securities
58,253

 
152

 
(253
)
 
58,152

Publicly traded equity securities
1,177

 
533

 
(4
)
 
1,706

Total (1)
$
59,430

 
$
685

 
$
(257
)
 
$
59,858


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 $80 million and $654 million as of April 29, 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
 
Nine Months Ended
 
April 29, 2017
 
April 30, 2016
 
April 29, 2017
 
April 30, 2016
Gross realized gains
$
43

 
$
68

 
$
91

 
$
119

Gross realized losses
(119
)
 
(74
)
 
(182
)
 
(145
)
Total
$
(76
)
 
$
(6
)
 
$
(91
)
 
$
(26
)



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
 
Nine Months Ended
 
April 29, 2017
 
April 30, 2016
 
April 29, 2017
 
April 30, 2016
Net gains (losses) on investments in publicly traded equity securities
$
(59
)
 
$
25

 
$
(50
)
 
$
18

Net gains (losses) on investments in fixed income securities
(17
)
 
(31
)
 
(41
)
 
(44
)
Total
$
(76
)
 
$
(6
)
 
$
(91
)
 
$
(26
)
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 April 29, 2017 and July 30, 2016 (in millions):
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
April 29, 2017
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
17,231

 
$
(67
)
 
$
16

 
$
—

 
$
17,247

 
$
(67
)
U.S. government agency securities
1,980

 
(6
)
 
—

 
—

 
1,980

 
(6
)
Non-U.S. government and agency securities
607

 
(2
)
 
6

 
—

 
613

 
(2
)
Corporate debt securities
11,915

 
(159
)
 
78

 
(1
)
 
11,993

 
(160
)
U.S. agency mortgage-backed securities
1,448

 
(18
)
 
4

 
—

 
1,452

 
(18
)
Total fixed income securities
33,181

 
(252
)

104


(1
)

33,285


(253
)
Publicly traded equity securities
50

 
(4
)
 
—

 
—

 
50

 
(4
)
Total
$
33,231

 
$
(256
)
 
$
104

 
$
(1
)
 
$
33,335

 
$
(257
)
 
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 April 29, 2017 (in millions): 
 
Amortized Cost
 
Fair Value
Less than 1 year
$
14,699

 
$
14,693

Due in 1 to 2 years
15,709

 
15,688

Due in 2 to 5 years
21,905

 
21,915

Due after 5 years
3,903

 
3,833

Mortgage-backed securities with no single maturity
2,037

 
2,023

Total
$
58,253

 
$
58,152
Equity Method and Cost Method Investments
For such investments that were accounted for under the equity and cost method as of April 29, 2017 and July 30, 2016, the amounts are summarized in the following table (in millions):
 
April 29, 2017
 
July 30, 2016
Equity method investments
$
130

 
$
174

Cost method investments
820

 
829

Total
$
950

 
$
1,003