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Derivative Financial Instruments (Tables)
3 Months Ended
Apr. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Contracts - Effect on Results of Operations
Periodic payments, valuation adjustments, and amortization of gains or losses on our derivative contracts had the following effect on our Consolidated Statements of Operations:
 
Derivative Contracts - Effect on Results of Operations
(millions)
Three Months Ended
Type of Contract
 
Classification of (Income)/Expense
April 30,
2016

 
May 2,
2015

Interest rate swaps
 
Net interest expense
$
(8
)
 
$
(9
)