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Derivative Instruments (Foreign Exchange Contracts - Cash Flow Hedging Disclosure) (Details)
CAD in Millions
 3 Months Ended 9 Months Ended
Oct. 31, 2015
USD ($)
Nov. 01, 2014
USD ($)
Oct. 31, 2015
USD ($)
Nov. 01, 2014
USD ($)
Jan. 31, 2015
USD ($)
Jan. 31, 2007
CAD
Foreign Currency Cash Flow Hedge Liability at Fair Value   $ 10,000,000   $ 10,000,000    
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness     $ 0      
Foreign Currency Cash Flow Hedge Asset at Fair Value $ 27,000,000   27,000,000   $ 21,000,000  
Other Comprehensive Income (Loss) [Member]            
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax 2,000,000 16,000,000 6,000,000 3,000,000    
Other Income (Loss) [Member]            
(Gain) Loss Reclassified from Accumulated Other Comprehensive Income (Loss) into Other Income (Loss) [1] $ 3,000,000 $ (13,000,000) $ (7,000,000) $ (5,000,000)    
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]            
Derivative, Notional Amount | CAD           CAD 270
[1] Represents reclassification of amounts from accumulated other comprehensive income to earnings to completely offset foreign currency transaction gains and losses recognized on the intercompany loans. No ineffectiveness was associated with these foreign exchange cash flow hedges