Restructuring (Composition of Restructuring Charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 01, 2020	Feb. 02, 2019	Feb. 03, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 41	$ 46	$ 10
U.S. Operating Model [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 41
Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		47	9
Cumulative Amount		56
Best Buy Mobile [Member] | Property and equipment impairments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1
Cumulative Amount		1
Best Buy Mobile [Member] | Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(2)	8
Cumulative Amount		6
Best Buy Mobile [Member] | Facility Closure And Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		49
Cumulative Amount		49
Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ (1)	$ 1