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Financial Instruments (Tables)
 3 Months Ended
Jul. 28, 2017
Investments [Abstract]  
Investments by Category and Related Balance Sheet Classification
The following table summarizes the Company's investments by significant investment category and the related consolidated balance sheet classification at July 28, 2017:
 
Valuation
 
Balance Sheet Classification
(in millions)
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
 
Investments
 
Other Assets
Available-for-sale securities:
 

 
 

 
 

 
 

 
 
 
 
Level 1:
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency securities
$
653

 
$
1

 
$
(4
)
 
$
650

 
$
650

 
$
—

Marketable equity securities
55

 
48

 
(2
)
 
101

 
—

 
101

Total Level 1
708

 
49

 
(6
)
 
751

 
650

 
101

Level 2:
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
4,157

 
73

 
(18
)
 
4,212

 
4,212

 
—

U.S. government and agency securities
854

 
—

 
(9
)
 
845

 
845

 
—

Mortgage-backed securities
804

 
9

 
(16
)
 
797

 
797

 
—

Foreign government and agency securities
49

 
—

 
—

 
49

 
49

 
—

Other asset-backed securities
258

 
1

 
(1
)
 
258

 
258

 
—

Debt funds
1,246

 
7

 
(158
)
 
1,095

 
1,095

 
—

Total Level 2
7,368

 
90

 
(202
)
 
7,256

 
7,256

 
—

Level 3:
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
1

 
—

 
—

 
1

 
—

 
1

Auction rate securities
47

 
—

 
(3
)
 
44

 
—

 
44

Total Level 3
48

 
—

 
(3
)
 
45

 
—

 
45

Investments measured at net asset value(1):
 

 
 

 
 

 
 

 
 
 
 
Debt Funds
497

 
—

 
(6
)
 
491

 
491

 
—

Total available-for-sale securities
8,621

 
139

 
(217
)
 
8,543

 
8,397

 
146

Cost method, equity method, and other investments:
 
 
 
 
 
 
 
 
 
 
 
Level 3:
 
 
 
 
 
 
 
 
 
 
 
Cost method, equity method, and other investments
627

 
—

 
—

 
N/A

 
—

 
627

Total Level 3
627

 
—

 
—

 
N/A

 
—

 
627

Total cost method, equity method, and other investments
627

 
—

 
—

 
N/A

 
—

 
627

Total investments
$
9,248

 
$
139

 
$
(217
)
 
$
8,543

 
$
8,397

 
$
773

(1) Certain investments that are measured at the net asset value per share (or its equivalent) as a practical expedient are excluded from the fair value hierarchy. The fair value amounts presented herein are intended to permit reconciliation to the consolidated balance sheets.

The following table summarizes the Company's investments by significant investment category and the related consolidated balance sheet classification at April 28, 2017:
 
Valuation
 
Balance Sheet Classification
(in millions)
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
 
Investments
 
Other Assets
Available-for-sale securities:
 

 
 

 
 

 
 

 
 
 
 
Level 1:
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency securities
$
613

 
$
2

 
$
(5
)
 
$
610

 
$
610

 
$
—

Marketable equity securities
58

 
49

 
(4
)
 
103

 
—

 
103

Total Level 1
671

 
51

 
(9
)
 
713

 
610

 
103

Level 2:
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
4,643

 
62

 
(23
)
 
4,682

 
4,682

 
—

U.S. government and agency securities
860

 
—

 
(10
)
 
850

 
850

 
—

Mortgage-backed securities
766

 
9

 
(16
)
 
759

 
759

 
—

Foreign government and agency securities
49

 
—

 
—

 
49

 
49

 
—

Other asset-backed securities
228

 
1

 
(1
)
 
228

 
228

 
—

Debt funds
1,246

 
4

 
(178
)
 
1,072

 
1,072

 
—

Total Level 2
7,792

 
76

 
(228
)
 
7,640

 
7,640

 
—

Level 3:
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
1

 
—

 
—

 
1

 
—

 
1

Auction rate securities
47

 
—

 
(3
)
 
44

 
—

 
44

Total Level 3
48

 
—

 
(3
)
 
45

 
—

 
45

Investments measured at net asset value(1):
 

 
 

 
 

 
 

 
 
 
 
Debt funds
497

 
—

 
(6
)
 
491

 
491

 
—

Total available-for-sale securities
9,008

 
127

 
(246
)
 
8,889

 
8,741

 
148

Cost method, equity method, and other investments:
 
 
 
 
 
 
 
 
 
 
 
Level 3:
 
 
 
 
 
 
 
 
 
 
 
Cost method, equity method, and other investments
589

 
—

 
—

 
N/A

 
—

 
589

Total Level 3
589

 
—

 
—

 
N/A

 
—

 
589

Total cost method, equity method, and other investments
589

 
—

 
—

 
N/A

 
—

 
589

Total investments
$
9,597

 
$
127

 
$
(246
)
 
$
8,889

 
$
8,741

 
$
737


(1) Certain investments that are measured at the net asset value per share (or its equivalent) as a practical expedient are excluded from the fair value hierarchy. The fair value amounts presented herein are intended to permit reconciliation to the consolidated balance sheets.
Available-For-Sale Securities in Continuous Unrealized Loss Position
The following tables present the gross unrealized losses and fair values of the Company’s available-for-sale securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category at July 28, 2017 and April 28, 2017:
 
July 28, 2017
 
Less than 12 months
 
More than 12 months
(in millions)
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Corporate debt securities
$
927

 
$
(13
)
 
$
47

 
$
(5
)
Auction rate securities
—

 
—

 
44

 
(3
)
Mortgage-backed securities
270

 
(3
)
 
92

 
(13
)
U.S. government and agency securities
898

 
(13
)
 
—

 
—

Debt funds
188

 
(1
)
 
1,126

 
(163
)
Other asset-backed securities
108

 
(1
)
 
—

 
—

Marketable equity securities
1

 
(1
)
 
2

 
(1
)
Total
$
2,392

 
$
(32
)
 
$
1,311

 
$
(185
)
 
April 28, 2017
 
Less than 12 months
 
More than 12 months
(in millions)
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Corporate debt securities
$
1,263

 
$
(19
)
 
$
46

 
$
(4
)
Auction rate securities
—

 
—

 
44

 
(3
)
Mortgage-backed securities
276

 
(4
)
 
95

 
(12
)
U.S. government and agency securities
896

 
(15
)
 
—

 
—

Other asset-backed securities
127

 
(1
)
 
—

 
—

Debt funds
173

 
(1
)
 
1,125

 
(183
)
Marketable equity securities
14

 
(3
)
 
2

 
(1
)
Total
$
2,749

 
$
(43
)
 
$
1,312

 
$
(203
)
Unobservable Inputs Utilized in the Fair Value Measurement of Auction Rate Securities Classified as Level 3
The following table presents the unobservable inputs utilized in the fair value measurement of the auction rate securities classified as Level 3 at July 28, 2017:

 
Valuation Technique
Unobservable Input
Range (Weighted Average)
Auction rate securities
Discounted cash flow
Years to principal recovery
2 yrs. - 12 yrs. (3 yrs.)
Illiquidity premium
6%
Reconciliation of Beginning and Ending Balances of Items Measured at Fair Value on a Recurring Basis that Used Significant Unobservable Inputs (Level 3)
The following tables provide a reconciliation of the beginning and ending balances of items measured at fair value on a recurring basis that used significant unobservable inputs (Level 3):
 
Three months ended July 28, 2017
(in millions)
Total Level 3
Investments
 
Corporate debt
securities
 
Auction rate
securities
April 28, 2017
$
45

 
$
1

 
$
44

Total unrealized gains (losses) included in other comprehensive income
—

 
—

 
—

July 28, 2017
$
45

 
$
1

 
$
44

 
 
 
 
 
 
 
Three months ended July 29, 2016
(in millions)
Total Level 3
Investments
 
Corporate debt
securities
 
Auction rate
securities
April 29, 2016
$
45

 
$
1

 
$
44

Total unrealized gains (losses) included in other comprehensive income
—

 
—

 
—

July 29, 2016
$
45

 
$
1

 
$
44
Activity Related to the Company's Investment Portfolio
Activity related to the Company’s investment portfolio is as follows:
 
Three months ended
 
July 28, 2017
 
July 29, 2016
(in millions)
Debt(1)
 
Equity(2)
 
Debt(1)
 
Equity(2)
Proceeds from sales
$
971

 
$
—

 
$
1,098

 
$
6

Gross realized gains
8

 
7

 
7

 
4

Gross realized losses
(3
)
 
—

 
(12
)
 
—

Impairment losses recognized
—

 
—

 
—

 
(3
)
(1)
Includes available-for-sale debt securities.
(2)
Includes marketable equity securities, cost and equity method investments, and other investments.
Available-for-sale Debt Securities Contractual Maturities
The July 28, 2017 balance of available-for-sale debt securities, excluding debt funds which have no single maturity date, by contractual maturity is shown in the following table. Within the table, maturities of mortgage-backed securities have been allocated based upon timing of estimated cash flows assuming no change in the current interest rate environment. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
(in millions)
July 28, 2017
Due in one year or less
$
888

Due after one year through five years
2,681

Due after five years through ten years
3,203

Due after ten years
84

Total
$
6,856