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Debt (Tables)
 3 Months Ended
Apr. 29, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
Long-term debt consisted of the following ($ in millions):
 
April 29, 2017
 
January 28, 2017
 
April 30, 2016
2018 Notes
$
500

 
$
500

 
$
500

2021 Notes
650

 
650

 
650

Interest rate swap valuation adjustments
3

 
13

 
15

Subtotal
1,153

 
1,163

 
1,165

Debt discounts and issuance costs
(4
)
 
(5
)
 
(6
)
Financing lease obligations
171

 
177

 
184

Capital lease obligations
27

 
30

 
35

Total long-term debt
1,347

 
1,365

 
1,378

Less: current portion
(45
)
 
(44
)
 
(44
)
Total long-term debt, less current portion
$
1,302

 
$
1,321

 
$
1,334