Restructuring Charges - Canadian Brand Consolidation (Details) $ in Millions		3 Months Ended
		Apr. 29, 2017 USD ($)	Apr. 30, 2016 USD ($)	May 02, 2015 store
Restructuring Reserve [Roll Forward]
Restructuring charges		$ 0	$ 29
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		34	66
Cash payments		(6)	(12)
Adjustments	[1]		(1)
Restructuring Reserve, Translation Adjustment		(1)	6
Restructuring reserve, balance at the end of the period		27	59
Restructuring Program Canadian Brand Consolidation [Member] | Termination benefits [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at the beginning of the period		0	2
Cash payments		0	(1)
Adjustments	[1]		0
Restructuring Reserve, Translation Adjustment		0	0
Restructuring reserve, balance at the end of the period		0	1
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		34	64
Cash payments		(6)	(11)
Adjustments	[1]		(1)
Restructuring Reserve, Translation Adjustment		(1)	6
Restructuring reserve, balance at the end of the period		27	58
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		0	(1)
Restructuring and Related Cost, Cost Incurred to Date		203
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	0
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	0
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	0
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	0
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		0	$ (1)
Restructuring and Related Cost, Cost Incurred to Date		$ 105

[1] Adjustments to facility closure and other costs represent changes in sublease assumptions. Adjustments to termination benefits represent changes in retention assumptions.