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Stock-Based Compensation (Tables)
 6 Months Ended
Oct. 26, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Components and Classification of Stock-based Compensation Expense
The following table presents the components and classification of stock-based compensation expense for stock options, restricted stock, and employee stock purchase plan shares recognized for the three and six months ended October 26, 2018 and October 27, 2017:
 
Three months ended
 
Six months ended
(in millions)
October 26, 2018
 
October 27, 2017
 
October 26, 2018
 
October 27, 2017
Stock options
$
33

 
$
42

 
$
51

 
$
77

Restricted stock
65

 
59

 
101

 
107

Employee stock purchase plan
6

 
5

 
16

 
14

Total stock-based compensation expense
$
104

 
$
106

 
$
168

 
$
198

 
 
 
 
 
 
 
 
Cost of products sold
$
12

 
$
14

 
$
18

 
$
24

Research and development expense
13

 
12

 
21

 
21

Selling, general, and administrative expense
79

 
80

 
129

 
153

Total stock-based compensation expense
104

 
106

 
168

 
198

Income tax benefits
(21
)
 
(32
)
 
(32
)
 
(57
)
Total stock-based compensation expense, net of tax
$
83

 
$
74

 
$
136

 
$
141