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Investments (Tables)
 9 Months Ended
Apr. 30, 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):
April 30, 2016
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
24,003

 
$
44

 
$
(3
)
 
$
24,044

U.S. government agency securities
2,883

 
5

 
—

 
2,888

Non-U.S. government and agency securities
1,063

 
2

 
—

 
1,065

Corporate debt securities
23,193

 
160

 
(37
)
 
23,316

U.S. agency mortgage-backed securities
1,746

 
16

 
—

 
1,762

Total fixed income securities
52,888

 
227

 
(40
)
 
53,075

Publicly traded equity securities
1,354

 
218

 
(30
)
 
1,542

Total
$
54,242

 
$
445

 
$
(70
)
 
$
54,617


July 25, 2015
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
29,904

 
$
41

 
$
(6
)
 
$
29,939

U.S. government agency securities
3,662

 
2

 
(1
)
 
3,663

Non-U.S. government and agency securities
1,128

 
1

 
(1
)
 
1,128

Corporate debt securities
15,802

 
34

 
(53
)
 
15,783

U.S. agency mortgage-backed securities
1,456

 
8

 
(3
)
 
1,461

Total fixed income securities
51,952

 
86

 
(64
)
 
51,974

Publicly traded equity securities
1,092

 
480

 
(7
)
 
1,565

Total
$
53,044

 
$
566

 
$
(71
)
 
$
53,539

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 30, 2016
 
April 25, 2015
 
April 30, 2016
 
April 25, 2015
Gross realized gains
$
68

 
$
55

 
$
119

 
$
168

Gross realized losses
(74
)
 
(11
)
 
(145
)
 
(48
)
Total
$
(6
)
 
$
44

 
$
(26
)
 
$
120

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 30, 2016
 
April 25, 2015
 
April 30, 2016
 
April 25, 2015
Net gains/(losses) on investments in publicly traded equity securities
$
25

 
$
38

 
$
18

 
$
94

Net gains/(losses) on investments in fixed income securities
(31
)
 
6

 
(44
)
 
26

Total
$
(6
)
 
$
44

 
$
(26
)
 
$
120
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 30, 2016 and July 25, 2015 (in millions):
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
April 30, 2016
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
4,315

 
$
(3
)
 
$
—

 
$
—

 
$
4,315

 
$
(3
)
U.S. government agency securities
287

 
—

 
—

 
—

 
287

 
—

Non-U.S. government and agency securities
192

 
—

 
—

 
—

 
192

 
—

Corporate debt securities
5,145

 
(27
)
 
1,089

 
(10
)
 
6,234

 
(37
)
U.S. agency mortgage-backed securities
137

 
—

 
18

 
—

 
155

 
—

Total fixed income securities
10,076

 
(30
)

1,107


(10
)

11,183


(40
)
Publicly traded equity securities
320

 
(30
)
 
—

 
—

 
320

 
(30
)
Total
$
10,396

 
$
(60
)
 
$
1,107

 
$
(10
)
 
$
11,503

 
$
(70
)
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
July 25, 2015
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
6,412

 
$
(6
)
 
$
—

 
$
—

 
$
6,412

 
$
(6
)
U.S. government agency securities
1,433

 
(1
)
 
—

 
—

 
1,433

 
(1
)
Non-U.S. government and agency securities
515

 
(1
)
 
4

 
—

 
519

 
(1
)
Corporate debt securities
9,552

 
(49
)
 
312

 
(4
)
 
9,864

 
(53
)
U.S. agency mortgage-backed securities
579

 
(3
)
 
—

 
—

 
579

 
(3
)
Total fixed income securities
18,491

 
(60
)
 
316

 
(4
)
 
18,807

 
(64
)
Publicly traded equity securities
108

 
(7
)
 
2

 
—

 
110

 
(7
)
Total
$
18,599

 
$
(67
)
 
$
318

 
$
(4
)
 
$
18,917

 
$
(71
)
Maturities of Fixed Income Securities
The following table summarizes the maturities of the Company’s fixed income securities as of April 30, 2016 (in millions): 
 
Amortized Cost
 
Fair Value
Less than 1 year
$
13,883

 
$
13,890

Due in 1 to 2 years
17,460

 
17,487

Due in 2 to 5 years
19,610

 
19,745

Due after 5 years
1,935

 
1,953

Total
$
52,888

 
$
53,075
Equity Method and Cost Method Investments
For such investments that were accounted for under the equity and cost method as of April 30, 2016 and July 25, 2015, the amounts are summarized in the following table (in millions):
 
April 30, 2016
 
July 25, 2015
Equity method investments
$
609

 
$
578

Cost method investments
367

 
319

Total
$
976

 
$
897