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Stock-Based Compensation (Tables)
 9 Months Ended
Jan. 25, 2013
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 25, 2013 and January 27, 2012:
 
Three months ended
 
Nine months ended
(in millions)
January 25,
2013
 
January 27,
2012
 
January 25,
2013
 
January 27,
2012
Stock options
$
9

 
$
12

 
$
36

 
$
48

Restricted stock awards
23

 
19

 
74

 
66

Employee stock purchase plan
2

 
3

 
9

 
10

Total stock-based compensation expense
$
34

 
$
34

 
$
119

 
$
124

 
 
 
 
 
 
 
 
Cost of products sold
$
3

 
$
3

 
$
10

 
$
10

Research and development expense
7

 
6

 
24

 
22

Selling, general, and administrative expense
24

 
25

 
85

 
92

Total stock-based compensation expense
$
34

 
$
34

 
$
119

 
$
124

 
 
 
 
 
 
 
 
Income tax benefits
(10
)
 
(9
)
 
(34
)
 
(35
)
 
 
 
 
 
 
 
 
Total stock-based compensation expense, net of tax
$
24

 
$
25

 
$
85

 
$
89