Restructuring Charges Restructuring Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 04, 2018 USD ($)	Jul. 29, 2017 USD ($)	Aug. 04, 2018 USD ($) store	Jul. 29, 2017 USD ($)	Feb. 03, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 17	$ 2	$ 47	$ 2
Best Buy Mobile
Restructuring Cost and Reserve [Line Items]
Restructuring charges	17	0	$ 47	0
Number of Stores to be Closed | store			257
Restructuring Reserve	3		$ 3		$ 8
Canadian brand consolidation
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	1	0	1
Renew Blue
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	$ 3	0	$ 3
Facility closure and other costs | Best Buy Mobile
Restructuring Cost and Reserve [Line Items]
Restructuring charges	20		49
Restructuring Reserve	2		2		$ 0
Facility closure and other costs | Canadian brand consolidation
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	11		11
Facility closure and other costs | Renew Blue
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	9		9
Facility closure and other costs | U.S. large format store closures
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 3		$ 3