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Stock-Based Compensation (Tables)
 9 Months Ended
Jan. 24, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Components and Classification of Stock-based Compensation Expense
The following table presents the components and classification of stock-based compensation expense recognized for the three and nine months ended January 24, 2014 and January 25, 2013:
 
Three months ended
 
Nine months ended
(in millions)
January 24,
2014
 
January 25,
2013
 
January 24,
2014
 
January 25,
2013
Stock options
$
7

 
$
9

 
$
27

 
$
36

Restricted stock awards
24

 
23

 
72

 
74

Employee stock purchase plan
2

 
2

 
9

 
9

Total stock-based compensation expense
$
33

 
$
34

 
$
108

 
$
119

 
 
 
 
 
 
 
 
Cost of products sold
$
3

 
$
3

 
$
10

 
$
10

Research and development expense
6

 
7

 
20

 
24

Selling, general, and administrative expense
24

 
24

 
78

 
85

Total stock-based compensation expense
$
33

 
$
34

 
$
108

 
$
119

 
 
 
 
 
 
 
 
Income tax benefits
(9
)
 
(10
)
 
(30
)
 
(34
)
 
 
 
 
 
 
 
 
Total stock-based compensation expense, net of tax
$
24

 
$
24

 
$
78

 
$
85