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Debt And Credit Facilities (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2015
USD ($)
Oct. 31, 2015
USD ($)
Nov. 01, 2014
Jan. 31, 2015
Short-term borrowings [Member]        
Debt Instrument [Line Items]        
Total short-term borrowing capacity $ 800 $ 800    
Terminated credit facility [Member]        
Debt Instrument [Line Items]        
Borrowing capacity of terminated facility 800 $ 800    
Maturity date   March 2018    
Unsecured revolving credit facility [Member]        
Debt Instrument [Line Items]        
Total short-term borrowing capacity 800 $ 800    
Maturity date   April 2020    
Issuances or borrowings 0 $ 0    
Debt covenant leverage ratio   4    
Commercial paper [Member]        
Debt Instrument [Line Items]        
Issuances or borrowings 0 $ 0    
Series 2011-1 Class A Notes, 2.28%, due October 2016 [Member]        
Debt Instrument [Line Items]        
Maturity date   October 2016 October 2016 October 2016
Debt defeased as a condition of closing the credit card receivable transaction $ 325