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Share Repurchases (Tables)
 9 Months Ended
Oct. 31, 2015
Disclosure Share Repurchase Activity [Abstract]  
Share Repurchase Activity
Share repurchase activity is as follows:
 
13 Weeks Ended
 
39 Weeks Ended
($ and shares in millions except average per share cost)
October 31,
2015
 
November 1,
2014
 
October 31,
2015
 
November 1,
2014
Number of shares repurchased
6.2

 
11.4

 
21.8

 
26.0

Total cost
$
200

 
$
433

 
$
807

 
$
1,016

Average per share cost including commissions
$
32.17

 
$
37.95

 
$
36.93

 
$
39.15