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Investments (Tables)
 3 Months Ended
Oct. 29, 2016
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):
October 29, 2016
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
25,905

 
$
24

 
$
(33
)
 
$
25,896

U.S. government agency securities
2,619

 
4

 
(1
)
 
2,622

Non-U.S. government and agency securities
1,104

 
1

 
(1
)
 
1,104

Corporate debt securities
29,046

 
177

 
(60
)
 
29,163

U.S. agency mortgage-backed securities
2,069

 
16

 
(2
)
 
2,083

Total fixed income securities
60,743

 
222

 
(97
)
 
60,868

Publicly traded equity securities
1,225

 
346

 
(54
)
 
1,517

Total (1)
$
61,968

 
$
568

 
$
(151
)
 
$
62,385


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 $328 million and $654 million as of October 29, 2016 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
 
October 29, 2016
 
October 24, 2015
Gross realized gains
$
30

 
$
35

Gross realized losses
(15
)
 
(36
)
Total
$
15

 
$
(1
)
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
 
October 29, 2016
 
October 24, 2015
Net gains/(losses) on investments in publicly traded equity securities
$
5

 
$
(9
)
Net gains/(losses) on investments in fixed income securities
10

 
8

Total
$
15

 
$
(1
)
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 October 29, 2016 and July 30, 2016 (in millions):
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
October 29, 2016
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
11,766

 
$
(33
)
 
$
100

 
$
—

 
$
11,866

 
$
(33
)
U.S. government agency securities
596

 
(1
)
 
—

 
—

 
596

 
(1
)
Non-U.S. government and agency securities
498

 
(1
)
 
—

 
—

 
498

 
(1
)
Corporate debt securities
9,013

 
(57
)
 
572

 
(3
)
 
9,585

 
(60
)
U.S. agency mortgage-backed securities
594

 
(2
)
 
—

 
—

 
594

 
(2
)
Total fixed income securities
22,467

 
(94
)

672


(3
)

23,139


(97
)
Publicly traded equity securities
291

 
(53
)
 
3

 
(1
)
 
294

 
(54
)
Total
$
22,758

 
$
(147
)
 
$
675

 
$
(4
)
 
$
23,433

 
$
(151
)
 
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 October 29, 2016 (in millions): 
 
Amortized Cost
 
Fair Value
Less than 1 year
$
12,967

 
$
12,977

Due in 1 to 2 years
17,042

 
17,071

Due in 2 to 5 years
25,125

 
25,230

Due after 5 years
3,540

 
3,507

Mortgage-backed securities with no single maturity
2,069

 
2,083

Total
$
60,743

 
$
60,868
Equity Method and Cost Method Investments
For such investments that were accounted for under the equity and cost method as of October 29, 2016 and July 30, 2016, the amounts are summarized in the following table (in millions):
 
October 29, 2016
 
July 30, 2016
Equity method investments
$
162

 
$
174

Cost method investments
829

 
829

Total
$
991

 
$
1,003