Restructuring Charges - Canadian Brand Consolidation (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 30, 2016 USD ($)	Aug. 01, 2015 USD ($)	Jul. 30, 2016 USD ($)	Aug. 01, 2015 USD ($) store
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 0	$ (4)	$ 29	$ 182
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			1	131
Cash payments			(19)	(39)
Adjustments			(1)	(6)
Restructuring Reserve, Translation Adjustment			4	(3)
Restructuring reserve, balance at the end of the period	51	83	51	83
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	27
Cash payments			(1)	(21)
Adjustments			0	(2)
Restructuring Reserve, Translation Adjustment			0	0
Restructuring reserve, balance at the end of the period	1	4	1	4
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			1	104
Cash payments			(18)	(18)
Adjustments			(1)	(4)
Restructuring Reserve, Translation Adjustment			4	(3)
Restructuring reserve, balance at the end of the period	50	79	50	79
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges	2	(4)	1	184
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2	(4)	1	184
Restructuring and Related Cost, Cost Incurred to Date	201		201
Restructuring Reserve [Roll Forward]
Restructuring charges	2	(4)	1	184
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] | Inventory write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		(3)	0	5
Restructuring and Related Cost, Cost Incurred to Date	3		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		1	0	30
Restructuring and Related Cost, Cost Incurred to Date	30		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	0	40
Restructuring and Related Cost, Cost Incurred to Date	40		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	0	24
Restructuring and Related Cost, Cost Incurred to Date	25		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	2	$ (2)	1	$ 85
Restructuring and Related Cost, Cost Incurred to Date	$ 103		$ 103