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Investments (Tables)
 12 Months Ended
Jul. 29, 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):
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

 
 
 
 
 
 
 
 
July 30, 2016
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
U.S. government securities
$
26,473

 
$
73

 
$
(2
)
 
$
26,544

U.S. government agency securities
2,809

 
8

 
—

 
2,817

Non-U.S. government and agency securities
1,096

 
4

 
—

 
1,100

Corporate debt securities
24,044

 
263

 
(15
)
 
24,292

U.S. agency mortgage-backed securities
1,846

 
22

 
—

 
1,868

Total fixed income securities
56,268

 
370

 
(17
)
 
56,621

Publicly traded equity securities
1,211

 
333

 
(40
)
 
1,504

Total (1)
$
57,479

 
$
703

 
$
(57
)

$
58,125


(1) Includes investments that were pending settlement as of the end of the respective fiscal years. The net unsettled investment purchases (sales) were $(30) million and $654 million as of July 29, 2017 and July 30, 2016, 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 the Company’s available-for-sale investments (in millions):
Years Ended
July 29, 2017
 
July 30, 2016
 
July 25, 2015
Gross realized gains
$
114

 
$
152

 
$
221

Gross realized losses
(201
)
 
(153
)
 
(64
)
Total
$
(87
)
 
$
(1
)
 
$
157

The following table presents the realized net gains and losses related to the Company’s available-for-sale investments by security type (in millions):
Years Ended
July 29, 2017
 
July 30, 2016
 
July 25, 2015
Net gains/(losses) on investments in publicly traded equity securities
$
(45
)
 
$
33

 
$
116

Net gains/(losses) on investments in fixed income securities
(42
)
 
(34
)
 
41

Total
$
(87
)
 
$
(1
)
 
$
157
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 July 29, 2017 and July 30, 2016 (in millions):
 
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
)
 
UNREALIZED LOSSES
LESS THAN 12 MONTHS
 
UNREALIZED LOSSES
12 MONTHS OR GREATER
 
TOTAL
July 30, 2016
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross 
Unrealized 
Losses
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. government securities 
$
2,414

 
$
(2
)
 
$
—

 
$
—

 
$
2,414

 
$
(2
)
U.S. government agency securities
144

 
—

 
—

 
—

 
144

 
—

Non-U.S. government and agency securities
61

 
—

 
—

 
—

 
61

 
—

Corporate debt securities
2,499

 
(7
)
 
1,208

 
(8
)
 
3,707

 
(15
)
U.S. agency mortgage-backed securities
174

 
—

 
—

 
—

 
174

 
—

Total fixed income securities
5,292

 
(9
)
 
1,208

 
(8
)
 
6,500

 
(17
)
Publicly traded equity securities
188

 
(40
)
 
—

 
—

 
188

 
(40
)
Total
$
5,480

 
$
(49
)
 
$
1,208

 
$
(8
)
 
$
6,688

 
$
(57
)
Maturities of Fixed Income Securities
The following table summarizes the maturities of the Company’s fixed income securities at July 29, 2017 (in millions): 
 
Amortized Cost
 
Fair Value
Less than 1 year
$
15,497

 
$
15,489

Due in 1 to 2 years
13,983

 
13,965

Due in 2 to 5 years
21,980

 
22,077

Due after 5 years
3,548

 
3,523

Mortgage-backed securities with no single maturity
2,037

 
2,023

Total
$
57,045

 
$
57,077
Equity Method Investments
For such investments that were accounted for under the equity and cost method as of July 29, 2017 and July 30, 2016, the amounts are summarized in the following table (in millions):
 
July 29, 2017
 
July 30, 2016
Equity method investments
$
124

 
$
174

Cost method investments
859

 
829

Total
$
983

 
$
1,003