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Investments (Tables)
 9 Months Ended
Apr. 25, 2015
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 25, 2015
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
29,364

 
$
59

 
$
(1
)
 
$
29,422

U.S. government agency securities
3,257

 
6

 
(1
)
 
3,262

Non-U.S. government and agency securities
1,184

 
2

 
—

 
1,186

Corporate debt securities
13,321

 
86

 
(13
)
 
13,394

U.S. agency mortgage-backed securities
1,346

 
16

 
—

 
1,362

Total fixed income securities
48,472

 
169

 
(15
)
 
48,626

Publicly traded equity securities
1,328

 
598

 
(3
)
 
1,923

Total
$
49,800

 
$
767

 
$
(18
)
 
$
50,549


July 26, 2014
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
31,717

 
$
29

 
$
(12
)
 
$
31,734

U.S. government agency securities
1,062

 
1

 
—

 
1,063

Non-U.S. government and agency securities
860

 
2

 
(1
)
 
861

Corporate debt securities
9,092

 
74

 
(7
)
 
9,159

U.S. agency mortgage-backed securities
574

 
5

 
—

 
579

Total fixed income securities
43,305

 
111

 
(20
)
 
43,396

Publicly traded equity securities
1,314

 
648

 
(10
)
 
1,952

Total
$
44,619

 
$
759

 
$
(30
)
 
$
45,348

Non-U.S. government and agency securities include agency and corporate debt securities that are guaranteed by non-U.S. governments.
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 25,
2015
 
April 26,
2014
 
April 25,
2015
 
April 26,
2014
Gross realized gains
$
55

 
$
75

 
$
168

 
$
267

Gross realized losses
(11
)
 
(6
)
 
(48
)
 
(33
)
Total
$
44

 
$
69

 
$
120

 
$
234

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 25,
2015
 
April 26,
2014
 
April 25,
2015
 
April 26,
2014
Net gains on investments in publicly traded equity securities
$
38

 
$
55

 
$
94

 
$
199

Net gains on investments in fixed income securities
6

 
14

 
26

 
35

Total
$
44

 
$
69

 
$
120

 
$
234
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 25, 2015 and July 26, 2014 (in millions):
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
April 25, 2015
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
4,096

 
$
(1
)
 
$
—

 
$
—

 
$
4,096

 
$
(1
)
U.S. government agency securities
702

 
(1
)
 
—

 
—

 
702

 
(1
)
Corporate debt securities
3,587

 
(12
)
 
157

 
(1
)
 
3,744

 
(13
)
Total fixed income securities
8,385

 
(14
)

157


(1
)

8,542


(15
)
Publicly traded equity securities
42

 
(3
)
 
1

 
—

 
43

 
(3
)
Total
$
8,427

 
$
(17
)
 
$
158

 
$
(1
)
 
$
8,585

 
$
(18
)
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
July 26, 2014
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
7,676

 
$
(12
)
 
$
45

 
$
—

 
$
7,721

 
$
(12
)
Non-U.S. government and agency securities
361

 
(1
)
 
22

 
—

 
383

 
(1
)
Corporate debt securities
1,875

 
(3
)
 
491

 
(4
)
 
2,366

 
(7
)
Total fixed income securities
9,912

 
(16
)
 
558

 
(4
)
 
10,470

 
(20
)
Publicly traded equity securities
132

 
(10
)
 
—

 
—

 
132

 
(10
)
Total
$
10,044

 
$
(26
)
 
$
558

 
$
(4
)
 
$
10,602

 
$
(30
)
Maturities of Fixed Income Securities
The following table summarizes the maturities of the Company’s fixed income securities at April 25, 2015 (in millions): 
 
Amortized Cost
 
Fair Value
Less than 1 year
$
16,322

 
$
16,332

Due in 1 to 2 years
14,969

 
15,006

Due in 2 to 5 years
15,610

 
15,697

Due after 5 years
1,571

 
1,591

Total
$
48,472

 
$
48,626
Equity Method and Cost Method Investments
For such investments that were accounted for under the equity and cost method as of April 25, 2015 and July 26, 2014, the amounts are summarized in the following table (in millions):
 
April 25,
2015
 
July 26,
2014
Equity method investments
$
561

 
$
630

Cost method investments
312

 
269

Total
$
873

 
$
899