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Debt and Credit Facilities Long Term Debt (Tables)
 9 Months Ended
Oct. 31, 2015
Debt Disclosure [Abstract]  
Long Term Debt
Total long-term debt, less current portion, is as follows:
($ in millions)
October 31,
2015
 
January 31,
2015
 
November 1,
2014
Notes
$
1,248

 
$
1,247

 
$
1,247

Japan Term Loan
104

 
106

 
133

Total long-term debt
1,352

 
1,353

 
1,380

Less: Current portion
(21
)
 
(21
)
 
(22
)
Total long-term debt, less current portion
$
1,331

 
$
1,332

 
$
1,358