Restructuring Charges Canadian Brand Consolidation (Details) $ in Millions		3 Months Ended								12 Months Ended
		Jan. 30, 2016 USD ($)	Oct. 31, 2015 USD ($)	Aug. 01, 2015 USD ($)	May. 02, 2015 USD ($)	Jan. 31, 2015 USD ($)	Nov. 01, 2014 USD ($)	Aug. 02, 2014 USD ($)	May. 03, 2014 USD ($)	Jan. 30, 2016 USD ($) store	Jan. 31, 2015 USD ($)	Feb. 01, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges										$ 198	$ 5	$ 149
Restructuring charges		$ 12	$ 7	$ (4)	$ 186	$ (7)	$ 5	$ 5	$ 2	$ 201	23	259
Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Number of Stores to be Closed | store										66
Payments for Restructuring										$ (71)
Restructuring Reserve, Accrual Adjustment	[1]									3
Restructuring Reserve, Translation Adjustment										(7)
Restructuring Reserve		66				0				66	0
Restructuring Charges, Rollforward										$ 141
Number of Future Shop stores converted to Best Buy stores | store										65
Employee Severance [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring										$ (24)
Restructuring Reserve, Accrual Adjustment	[1]									(2)
Restructuring Reserve, Translation Adjustment										0
Restructuring Reserve		2								2
Restructuring Charges, Rollforward										28
Facility Closing [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring										(47)
Restructuring Reserve, Accrual Adjustment	[1]									5
Restructuring Reserve, Translation Adjustment										(7)
Restructuring Reserve		$ 64				$ 0				64	0
Restructuring Charges, Rollforward										113
Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										201	5	$ 149
Restructuring charges										201	$ 5
Continuing Operations [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										200
Continuing Operations [Member] | International [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										200
Restructuring charges										200
Continuing Operations [Member] | International [Member] | Inventory write-downs [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										3
Continuing Operations [Member] | International [Member] | Property and equipment write-downs [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										30
Continuing Operations [Member] | International [Member] | Tradename Impairment [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										40
Continuing Operations [Member] | International [Member] | Employee Severance [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										25
Continuing Operations [Member] | International [Member] | Facility Closing [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										$ 102

[1] (1) The adjustments related to termination benefits relate to higher-than-expected employee retention. Adjustments to facility closure and other costs represent changes in sublease assumptions.