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Data Breach - Narrative (Details)
$ in Millions
 3 Months Ended 30 Months Ended
Apr. 30, 2016
USD ($)
action
May. 02, 2015
USD ($)
Apr. 30, 2016
USD ($)
Loss Contingencies [Line Items]      
Cumulative expenses incurred $ 0 $ 3  
Data Breach      
Loss Contingencies [Line Items]      
Cumulative expenses incurred     $ 291
Expected insurance recoveries     90
Net cumulative expense     $ 201
Data Breach | Canada      
Loss Contingencies [Line Items]      
Number of actions filed in court | action 1