Restructuring Charges (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 03, 2019 USD ($)	Aug. 04, 2018 USD ($)	Aug. 03, 2019 USD ($)	Aug. 04, 2018 USD ($)	Feb. 02, 2019 USD ($)	Mar. 01, 2018 store	Feb. 03, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 48	$ 17	$ 48	$ 47
U.S. Operating Model [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	48		48
Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		17		47
Number of stores to be closed | store						257
Restructuring reserve		3		3			$ 8
Facility closure and other costs [Member] | Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		20		49
Restructuring reserve		2		2
Voluntary Early Retirement [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	10
Termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	48
Termination benefits [Member] | U.S. Operating Model [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 40		$ 40
Termination benefits [Member] | Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(3)		(2)
Restructuring reserve		$ 1		$ 1			$ 8