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Investments (Tables)
 3 Months Ended
Oct. 28, 2017
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 28, 2017
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
20,564

 
$
—

 
$
(93
)
 
$
20,471

U.S. government agency securities
1,923

 
—

 
(6
)
 
1,917

Non-U.S. government and agency securities
358

 
—

 
(1
)
 
357

Corporate debt securities
31,999

 
162

 
(131
)
 
32,030

U.S. agency mortgage-backed securities
2,095

 
2

 
(23
)
 
2,074

Commercial paper
1,775

 
—

 
—

 
1,775

Certificates of deposit
140

 
—

 
—

 
140

Total fixed income securities
58,854

 
164

 
(254
)
 
58,764

Publicly traded equity securities
1,134

 
653

 
(6
)
 
1,781

Total (1)
$
59,988

 
$
817

 
$
(260
)
 
$
60,545


July 29, 2017
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
19,880

 
$
3

 
$
(60
)
 
$
19,823

U.S. government agency securities
2,057

 
—

 
(5
)
 
2,052

Non-U.S. government and agency securities
389

 
—

 
(1
)
 
388

Corporate debt securities
31,626

 
202

 
(93
)
 
31,735

U.S. agency mortgage-backed securities
2,037

 
3

 
(17
)
 
2,023

Commercial paper
996

 
—

 
—

 
996

Certificates of deposit
60

 
—

 
—

 
60

Total fixed income securities
57,045

 
208

 
(176
)
 
57,077

Publicly traded equity securities
1,180

 
554

 
(27
)
 
1,707

Total (1)
$
58,225

 
$
762

 
$
(203
)
 
$
58,784

(1) Includes investments that were pending settlement as of the respective fiscal years. The net unsettled investment purchases (sales) were $95 million and $(30) million as of October 28, 2017 and July 29, 2017, respectively.
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 available-for-sale investments (in millions):
 
Three Months Ended
 
October 28, 2017
 
October 29, 2016
Gross realized gains
$
67

 
$
30

Gross realized losses
(34
)
 
(15
)
Total
$
33

 
$
15


The following table presents the realized net gains (losses) related to available-for-sale investments by security type (in millions):
 
Three Months Ended
 
October 28, 2017
 
October 29, 2016
Net gains (losses) on investments in publicly traded equity securities
$
29

 
$
5

Net gains (losses) on investments in fixed income securities
4

 
10

Total
$
33

 
$
15
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 28, 2017 and July 29, 2017 (in millions):
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
October 28, 2017
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
16,719

 
$
(66
)
 
$
3,602

 
$
(27
)
 
$
20,321

 
$
(93
)
U.S. government agency securities
1,696

 
(4
)
 
222

 
(2
)
 
1,918

 
(6
)
Non-U.S. government and agency securities
316

 
(1
)
 
41

 
—

 
357

 
(1
)
Corporate debt securities
8,129

 
(45
)
 
4,209

 
(86
)
 
12,338

 
(131
)
U.S. agency mortgage-backed securities
1,562

 
(16
)
 
266

 
(7
)
 
1,828

 
(23
)
Total fixed income securities
28,422

 
(132
)

8,340


(122
)

36,762


(254
)
Publicly traded equity securities
54

 
(6
)
 
—

 
—

 
54

 
(6
)
Total
$
28,476

 
$
(138
)
 
$
8,340

 
$
(122
)
 
$
36,816

 
$
(260
)
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
July 29, 2017
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
14,962

 
$
(55
)
 
$
771

 
$
(5
)
 
$
15,733

 
$
(60
)
U.S. government agency securities
1,791

 
(4
)
 
130

 
(1
)
 
1,921

 
(5
)
Non-U.S. government and agency securities
368

 
(1
)
 
—

 
—

 
368

 
(1
)
Corporate debt securities
9,487

 
(92
)
 
101

 
(1
)
 
9,588

 
(93
)
U.S. agency mortgage-backed securities
1,485

 
(16
)
 
38

 
(1
)
 
1,523

 
(17
)
Total fixed income securities
28,093

 
(168
)
 
1,040

 
(8
)
 
29,133

 
(176
)
Publicly traded equity securities
122

 
(27
)
 
—

 
—

 
122

 
(27
)
Total
$
28,215

 
$
(195
)
 
$
1,040

 
$
(8
)
 
$
29,255

 
$
(203
)
Maturities of Fixed Income Securities
The following table summarizes the maturities of the Company’s fixed income securities as of October 28, 2017 (in millions): 
 
Amortized Cost
 
Fair Value
Less than 1 year
$
16,376

 
$
16,360

Due in 1 to 2 years
14,866

 
14,820

Due in 2 to 5 years
21,852

 
21,883

Due after 5 years
3,665

 
3,627

Mortgage-backed securities with no single maturity
2,095

 
2,074

Total
$
58,854

 
$
58,764
Equity Method and Cost Method Investments
For such investments that were accounted for under the equity and cost method as of October 28, 2017 and July 29, 2017, the amounts are summarized in the following table (in millions):
 
October 28, 2017
 
July 29, 2017
Equity method investments
$
108

 
$
124

Cost method investments
839

 
859

Total
$
947

 
$
983