Restructuring Charges Canadian Brand Consolidation (Details) $ in Millions		3 Months Ended								12 Months Ended
		Jan. 28, 2017 USD ($)	Oct. 29, 2016 USD ($)	Jul. 30, 2016 USD ($)	Apr. 30, 2016 USD ($)	Jan. 30, 2016 USD ($)	Oct. 31, 2015 USD ($)	Aug. 01, 2015 USD ($)	May 02, 2015 USD ($)	Jan. 28, 2017 USD ($) store	Jan. 30, 2016 USD ($)	Jan. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges										$ 39	$ 198	$ 5
Restructuring charges		$ 9	$ 1	$ 0	$ 29	$ 12	$ 7	$ (4)	$ 186	$ 39	201	23
Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Number of Stores to be Closed | store										66
Payments for Restructuring										$ (39)	(71)
Restructuring Reserve, Accrual Adjustment	[1]									2	3
Restructuring Reserve, Translation Adjustment										4	(7)
Restructuring Reserve		34				66				34	66	0
Restructuring Charges, Rollforward										$ 1	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										$ (2)	(24)
Restructuring Reserve, Accrual Adjustment	[1]									0	(2)
Restructuring Reserve, Translation Adjustment										0	0
Restructuring Reserve		0				2				0	2	0
Restructuring Charges, Rollforward										0	28
Facility Closing [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring										(37)	(47)
Restructuring Reserve, Accrual Adjustment	[1]									2	5
Restructuring Reserve, Translation Adjustment										4	(7)
Restructuring Reserve		$ 34				$ 64				34	64	0
Restructuring Charges, Rollforward										1	113
Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										39	201	5
Restructuring charges										39	201
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										3	200	$ 0
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										0	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										0	30
Continuing Operations [Member] | International [Member] | Tradename Impairment [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										0	40
Continuing Operations [Member] | International [Member] | Employee Severance [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										0	25
Continuing Operations [Member] | International [Member] | Facility Closing [Member] | Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges										$ 3	$ 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.