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Investments (Tables)
 3 Months Ended
Oct. 24, 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):
October 24, 2015
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
27,409

 
$
63

 
$
(1
)
 
$
27,471

U.S. government agency securities
3,606

 
11

 
—

 
3,617

Non-U.S. government and agency securities
1,133

 
3

 
—

 
1,136

Corporate debt securities
18,314

 
70

 
(78
)
 
18,306

U.S. agency mortgage-backed securities
1,454

 
15

 
—

 
1,469

Total fixed income securities
51,916

 
162

 
(79
)
 
51,999

Publicly traded equity securities
1,094

 
268

 
(12
)
 
1,350

Total
$
53,010

 
$
430

 
$
(91
)
 
$
53,349


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
 
October 24, 2015
 
October 25, 2014
Gross realized gains
$
35

 
$
21

Gross realized losses
(36
)
 
(14
)
Total
$
(1
)
 
$
7

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 24, 2015
 
October 25, 2014
Net losses on investments in publicly traded equity securities
$
(9
)
 
$
(4
)
Net gains on investments in fixed income securities
8

 
11

Total
$
(1
)
 
$
7
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 24, 2015 and July 25, 2015 (in millions):
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
October 24, 2015
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
2,566

 
$
(1
)
 
$
—

 
$
—

 
$
2,566

 
$
(1
)
U.S. government agency securities
80

 
—

 
—

 
—

 
80

 
—

Non-U.S. government and agency securities
57

 
—

 
10

 
—

 
67

 
—

Corporate debt securities
7,421

 
(66
)
 
1,048

 
(12
)
 
8,469

 
(78
)
U.S. agency mortgage-backed securities
77

 
—

 
—

 
—

 
77

 
—

Total fixed income securities
10,201

 
(67
)

1,058


(12
)

11,259


(79
)
Publicly traded equity securities
103

 
(11
)
 
2

 
(1
)
 
105

 
(12
)
Total
$
10,304

 
$
(78
)
 
$
1,060

 
$
(13
)
 
$
11,364

 
$
(91
)
 
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 at October 24, 2015 (in millions): 
 
Amortized Cost
 
Fair Value
Less than 1 year
$
17,274

 
$
17,276

Due in 1 to 2 years
15,914

 
15,950

Due in 2 to 5 years
17,105

 
17,138

Due after 5 years
1,623

 
1,635

Total
$
51,916

 
$
51,999
Equity Method and Cost Method Investments
For such investments that were accounted for under the equity and cost method as of October 24, 2015 and July 25, 2015, the amounts are summarized in the following table (in millions):
 
October 24, 2015
 
July 25, 2015
Equity method investments
$
619

 
$
578

Cost method investments
309

 
319

Total
$
928

 
$
897