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Restructuring Charges - Canadian Brand Consolidation (Details)
$ in Millions
 3 Months Ended
Apr. 30, 2016
USD ($)
May. 02, 2015
USD ($)
store
Restructuring Reserve [Roll Forward]    
Restructuring charges $ 29 $ 186
Restructuring Program Canadian Brand Consolidation [Member]    
Restructuring Cost and Reserve [Line Items]    
Number of stores to be closed | store   66
Number of Future Shop stores converted to Best Buy stores | store   65
Restructuring Reserve [Roll Forward]    
Restructuring reserve, balance at the beginning of the period 66 $ 0
Restructuring charges 0 122
Cash payments (12) (20)
Adjustments [1] (1)  
Restructuring Reserve, Translation Adjustment 6 4
Restructuring reserve, balance at the end of the period 59 106
Restructuring Program Canadian Brand Consolidation [Member] | Termination benefits [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring reserve, balance at the beginning of the period 2 0
Restructuring charges 0 24
Cash payments (1) (17)
Adjustments [1] 0  
Restructuring Reserve, Translation Adjustment 0 1
Restructuring reserve, balance at the end of the period 1 8
Restructuring Program Canadian Brand Consolidation [Member] | Facility closure and other costs [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring reserve, balance at the beginning of the period 64 0
Restructuring charges 0 98
Cash payments (11) (3)
Adjustments [1] (1)  
Restructuring Reserve, Translation Adjustment 6 3
Restructuring reserve, balance at the end of the period 58 98
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring charges (1) 188
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges (1) 188
Restructuring and Related Cost, Cost Incurred to Date 199  
Restructuring Reserve [Roll Forward]    
Restructuring charges (1) 188
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] | Inventory write-downs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 0 8
Restructuring and Related Cost, Cost Incurred to Date 3  
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] | Property and equipment impairments [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 0 29
Restructuring and Related Cost, Cost Incurred to Date 30  
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] | Impairment of Intangible Assets Related to Restructuring [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 0 40
Restructuring and Related Cost, Cost Incurred to Date 40  
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] | Termination benefits [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 0 24
Restructuring and Related Cost, Cost Incurred to Date 25  
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] | Facility closure and other costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges (1) $ 87
Restructuring and Related Cost, Cost Incurred to Date $ 101  
[1] Adjustments to facility closure and other costs represent changes in sublease assumptions.