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Restructuring Activities (Details)
$ in Millions
3 Months Ended
Apr. 30, 2016
USD ($)
position
Restructuring Charges $ 35
Home Office Employees [Member]  
Restructuring and Related Cost, Number of Positions Eliminated | position 200
Cost of Goods Sold, Buying and Occupancy [Member]  
Restructuring Charges $ 11
Selling, General and Administrative Expenses [Member]  
Severance Costs 24
Non-cash Charge [Member]  
Restructuring Charges $ 10