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Stock-Based Compensation (Tables)
 3 Months Ended
Jul. 26, 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 months ended July 26, 2013 and July 27, 2012:
 
Three months ended
(in millions)
July 26,
2013
 
July 27,
2012
Stock options
$
8

 
$
11

Restricted stock awards
19

 
21

Employee stock purchase plan
4

 
4

Total stock-based compensation expense
$
31

 
$
36

 
 
 
 
Cost of products sold
$
3

 
$
3

Research and development expense
6

 
7

Selling, general, and administrative expense
22

 
26

Total stock-based compensation expense
$
31

 
$
36

 
 
 
 
Income tax benefits
(8
)
 
(10
)
 
 
 
 
Total stock-based compensation expense, net of tax
$
23

 
$
26