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Stock-Based Compensation
 6 Months Ended
Oct. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
Under the fair value recognition provisions of U.S. GAAP for accounting for stock-based compensation, the Company measures stock-based compensation expense at the grant date based on the fair value of the award and recognizes the compensation expense over the requisite service period, which is generally the vesting period.
The following table presents the components and classification of stock-based compensation expense recognized for the three and six months ended October 30, 2015 and October 24, 2014:
 
Three months ended
 
Six months ended
(in millions)
October 30,
2015
 
October 24,
2014
 
October 30,
2015
 
October 24,
2014
Stock options
$
62

 
$
14

 
$
119

 
$
20

Restricted stock awards
46

 
31

 
80

 
54

Employee stock purchase plan
5

 
3

 
10

 
8

Total stock-based compensation expense
$
113

 
$
48

 
$
209

 
$
82

 
 
 
 
 
 
 
 
Cost of products sold
$
14

 
$
4

 
$
26

 
$
8

Research and development expense
12

 
9

 
20

 
15

Selling, general, and administrative expense
65

 
35

 
114

 
59

Restructuring charges, net
6

 
—

 
14

 
—

Acquisition-related items
16

 
—

 
35

 
—

Total stock-based compensation expense
$
113

 
$
48

 
$
209

 
$
82

 
 
 
 
 
 
 
 
Income tax benefits
(34
)
 
(14
)
 
(63
)
 
(23
)
 
 
 
 
 
 
 
 
Total stock-based compensation expense, net of tax
$
79

 
$
34

 
$
146

 
$
59