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Share-Based Compensation (Tables)
9 Months Ended
Oct. 27, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation Expense
Share-based compensation expense recognized in the Condensed Consolidated Statements of Income, primarily in operating expenses, is as follows:
 
13 Weeks Ended
 
39 Weeks Ended
($ in millions)
October 27,
2012
 
October 29,
2011
 
October 27,
2012
 
October 29,
2011
Stock units
$
28

 
$
11

 
$
71

 
$
35

Stock options
5

 
4

 
13

 
12

Employee stock purchase plan
1

 
1

 
3

 
3

Share-based compensation expense
34

 
16

 
87

 
50

Less: Income tax benefit
(13
)
 
(7
)
 
(33
)
 
(20
)
Share-based compensation expense, net of tax
$
21

 
$
9

 
$
54

 
$
30