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Investments (Tables)
 3 Months Ended
Oct. 25, 2014
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 25, 2014
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
32,343

 
$
71

 
$
—

 
$
32,414

U.S. government agency securities
1,338

 
3

 
—

 
1,341

Non-U.S. government and agency securities
1,049

 
2

 
—

 
1,051

Corporate debt securities
10,170

 
73

 
(10
)
 
10,233

U.S. agency mortgage-backed securities
875

 
9

 
—

 
884

Total fixed income securities
45,775

 
158

 
(10
)
 
45,923

Publicly traded equity securities
1,263

 
545

 
(11
)
 
1,797

Total
$
47,038

 
$
703

 
$
(21
)
 
$
47,720

 
 
 
 
 
 
 
 
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
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 25, 2014
 
October 26, 2013
Gross realized gains
$
21

 
$
95

Gross realized losses
(14
)
 
(12
)
Total
$
7

 
$
83

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 25, 2014
 
October 26, 2013
Net gains (losses) on investments in publicly traded equity securities
$
(4
)
 
$
75

Net gains on investments in fixed income securities
11

 
8

Total
$
7

 
$
83
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 25, 2014 and July 26, 2014 (in millions):
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
October 25, 2014
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
$
2,491

 
$
(8
)
 
$
383

 
$
(2
)
 
$
2,874

 
$
(10
)
Total fixed income securities
2,491

 
(8
)

383


(2
)

2,874


(10
)
Publicly traded equity securities
131

 
(11
)
 
1

 
—

 
132

 
(11
)
Total
$
2,622

 
$
(19
)
 
$
384

 
$
(2
)
 
$
3,006

 
$
(21
)
 
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 October 25, 2014 (in millions): 
 
Amortized Cost
 
Fair Value
Less than 1 year
$
16,643

 
$
16,656

Due in 1 to 2 years
14,222

 
14,270

Due in 2 to 5 years
13,884

 
13,957

Due after 5 years
1,026

 
1,040

Total
$
45,775

 
$
45,923
Equity Method and Cost Method Investments
 
October 25, 2014
 
July 26, 2014
Equity method investments
$
559

 
$
630

Cost method investments
327

 
269

Total
$
886

 
$
899