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Investments (Tables)
 9 Months Ended
Apr. 26, 2014
Investments [Abstract]  
Schedule of Available-for-sale Securities Reconciliation
The following tables summarize the Company’s available-for-sale investments (in millions):
April 26, 2014
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
31,675

 
$
34

 
$
(6
)
 
$
31,703

U.S. government agency securities
1,060

 
2

 
(1
)
 
1,061

Non-U.S. government and agency securities
819

 
2

 
(1
)
 
820

Corporate debt securities
8,050

 
75

 
(10
)
 
8,115

U.S. agency mortgage-backed securities
567

 
3

 
—

 
570

Total fixed income securities
42,171

 
116

 
(18
)
 
42,269

Publicly traded equity securities
1,314

 
652

 
(7
)
 
1,959

Total
$
43,485

 
$
768

 
$
(25
)
 
$
44,228

July 27, 2013
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
27,814

 
$
22

 
$
(13
)
 
$
27,823

U.S. government agency securities
3,083

 
7

 
(1
)
 
3,089

Non-U.S. government and agency securities
1,094

 
3

 
(2
)
 
1,095

Corporate debt securities
7,876

 
55

 
(50
)
 
7,881

Total fixed income securities
39,867

 
87

 
(66
)
 
39,888

Publicly traded equity securities
2,063

 
738

 
(4
)
 
2,797

Total
$
41,930

 
$
825

 
$
(70
)
 
$
42,685
Schedule of Realized Gain (Loss)
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 26,
2014
 
April 27,
2013
 
April 26,
2014
 
April 27,
2013
Gross realized gains
$
75

 
$
55

 
$
267

 
$
175

Gross realized losses
(6
)
 
(49
)
 
(33
)
 
(129
)
Total
$
69

 
$
6

 
$
234

 
$
46

The following table presents the realized net gains related to the Company’s available-for-sale investments by security type (in millions):
 
Three Months Ended
 
Nine Months Ended
 
April 26,
2014
 
April 27,
2013
 
April 26,
2014
 
April 27,
2013
Net gains (losses) on investments in publicly traded equity securities
$
55

 
$
(2
)
 
$
199

 
$
12

Net gains on investments in fixed income securities
14

 
8

 
35

 
34

         Total
$
69

 
$
6

 
$
234

 
$
46
Schedule of Unrealized Loss on Investments
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 26, 2014 and July 27, 2013 (in millions):
 
UNREALIZED LOSSES LESS THAN 12 MONTHS
 
UNREALIZED LOSSES 12 MONTHS OR GREATER
 
TOTAL
April 26, 2014
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
5,111

 
$
(6
)
 
$
8

 
$
—

 
$
5,119

 
$
(6
)
U.S. government agency securities
396

 
(1
)
 
3

 
—

 
399

 
(1
)
Non-U.S. government and agency securities
378

 
(1
)
 
—

 
—

 
378

 
(1
)
Corporate debt securities
1,654

 
(10
)
 
52

 
—

 
1,706

 
(10
)
U.S. agency mortgage-backed securities
158

 
—

 
—

 
—

 
158

 
—

Total fixed income securities
7,697

 
(18
)
 
63

 
—

 
7,760

 
(18
)
Publicly traded equity securities
117

 
(7
)
 
—

 
—

 
117

 
(7
)
Total
$
7,814

 
$
(25
)
 
$
63

 
$
—

 
$
7,877

 
$
(25
)

 
UNREALIZED LOSSES LESS THAN 12 MONTHS
 
UNREALIZED LOSSES 12 MONTHS OR GREATER
 
TOTAL
July 27, 2013
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
7,865

 
$
(13
)
 
$
—

 
$
—

 
$
7,865

 
$
(13
)
U.S. government agency securities
294

 
(1
)
 
—

 
—

 
294

 
(1
)
Non-U.S. government and agency securities
432

 
(2
)
 
—

 
—

 
432

 
(2
)
Corporate debt securities
3,704

 
(50
)
 
4

 
—

 
3,708

 
(50
)
Total fixed income securities
12,295

 
(66
)
 
4

 
—

 
12,299

 
(66
)
Publicly traded equity securities
278

 
(4
)
 
—

 
—

 
278

 
(4
)
Total
$
12,573

 
$
(70
)
 
$
4

 
$
—

 
$
12,577

 
$
(70
)
Investments Classified by Contractual Maturity Date
The following table summarizes the maturities of the Company’s fixed income securities at April 26, 2014 (in millions): 
 
Amortized Cost
 
Fair Value
Less than 1 year
$
15,022

 
$
15,038

Due in 1 to 2 years
13,061

 
13,101

Due in 2 to 5 years
13,380

 
13,415

Due after 5 years
708

 
715

Total
$
42,171

 
$
42,269