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Share-Based Compensation (Tables)
 9 Months Ended
Oct. 29, 2016
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 29,
2016
 
October 31,
2015
 
October 29,
2016
 
October 31,
2015
Stock units
$
14

 
$
12

 
$
43

 
$
46

Stock options
4

 
2

 
9

 
8

Employee stock purchase plan
1

 
1

 
3

 
4

Share-based compensation expense
19

 
15

 
55

 
58

Less: Income tax benefit
(8
)
 
(6
)
 
(25
)
 
(22
)
Share-based compensation expense, net of tax
$
11

 
$
9

 
$
30

 
$
36