Restructuring Charges - Canadian Brand Consolidation (Details) (Restructuring Program Canadian Brand Consolidation [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	May 02, 2015
Restructuring Cost and Reserve [Line Items]
Number of stores to be closed	66
Number of Future Shop stores converted to Best Buy stores	65
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at the beginning of the period	$ 0
Restructuring Charges, Rollforward	122
Cash payments	(20)
Restructuring Reserve, Translation Adjustment	4
Restructuring reserve, balance at the end of the period	106
Termination benefits [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at the beginning of the period	0
Restructuring Charges, Rollforward	24
Cash payments	(17)
Restructuring Reserve, Translation Adjustment	1
Restructuring reserve, balance at the end of the period	8
Facility closure and other costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at the beginning of the period	0
Restructuring Charges, Rollforward	98
Cash payments	(3)
Restructuring Reserve, Translation Adjustment	3
Restructuring reserve, balance at the end of the period	98
Continuing Operations [Member] | International Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	188
Continuing Operations [Member] | International Segment [Member] | Inventory write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	8
Continuing Operations [Member] | International Segment [Member] | Property and equipment impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	29
Continuing Operations [Member] | International Segment [Member] | Impairment of Intangible Assets Related to Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	40
Continuing Operations [Member] | International Segment [Member] | Termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	24
Continuing Operations [Member] | International Segment [Member] | Facility closure and other costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	87
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	200
Expected Payments for Restructuring	140
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	280
Expected Payments for Restructuring	$ 180