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Investments (Tables)
 6 Months Ended
Jan. 23, 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):
January 23, 2016
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
28,242

 
$
18

 
$
(16
)
 
$
28,244

U.S. government agency securities
3,492

 
3

 
(2
)
 
3,493

Non-U.S. government and agency securities
1,152

 
1

 
(1
)
 
1,152

Corporate debt securities
18,410

 
29

 
(158
)
 
18,281

U.S. agency mortgage-backed securities
1,452

 
9

 
(1
)
 
1,460

Total fixed income securities
52,748

 
60

 
(178
)
 
52,630

Publicly traded equity securities
1,318

 
176

 
(63
)
 
1,431

Total
$
54,066

 
$
236

 
$
(241
)
 
$
54,061


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
 
Six Months Ended
 
January 23, 2016
 
January 24, 2015
 
January 23, 2016
 
January 24, 2015
Gross realized gains
$
16

 
$
92

 
$
51

 
$
113

Gross realized losses
(35
)
 
(23
)
 
(71
)
 
(37
)
Total
$
(19
)
 
$
69

 
$
(20
)
 
$
76

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
 
Six Months Ended
 
January 23, 2016
 
January 24, 2015
 
January 23, 2016
 
January 24, 2015
Net gains/(losses) on investments in publicly traded equity securities
$
2

 
$
60

 
$
(7
)
 
$
56

Net gains/(losses) on investments in fixed income securities
(21
)
 
9

 
(13
)
 
20

Total
$
(19
)
 
$
69

 
$
(20
)
 
$
76
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 January 23, 2016 and July 25, 2015 (in millions):
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
January 23, 2016
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
15,432

 
$
(16
)
 
$
3

 
$
—

 
$
15,435

 
$
(16
)
U.S. government agency securities
1,793

 
(2
)
 
—

 
—

 
1,793

 
(2
)
Non-U.S. government and agency securities
645

 
(1
)
 
17

 
—

 
662

 
(1
)
Corporate debt securities
11,565

 
(136
)
 
1,252

 
(22
)
 
12,817

 
(158
)
U.S. agency mortgage-backed securities
387

 
(1
)
 
—

 
—

 
387

 
(1
)
Total fixed income securities
29,822

 
(156
)

1,272


(22
)

31,094


(178
)
Publicly traded equity securities
694

 
(62
)
 
2

 
(1
)
 
696

 
(63
)
Total
$
30,516

 
$
(218
)
 
$
1,274

 
$
(23
)
 
$
31,790

 
$
(241
)
 
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 January 23, 2016 (in millions): 
 
Amortized Cost
 
Fair Value
Less than 1 year
$
17,569

 
$
17,555

Due in 1 to 2 years
16,105

 
16,081

Due in 2 to 5 years
17,423

 
17,345

Due after 5 years
1,651

 
1,649

Total
$
52,748

 
$
52,630
Equity Method and Cost Method Investments
For such investments that were accounted for under the equity and cost method as of January 23, 2016 and July 25, 2015, the amounts are summarized in the following table (in millions):
 
January 23, 2016
 
July 25, 2015
Equity method investments
$
605

 
$
578

Cost method investments
359

 
319

Total
$
964

 
$
897