Restructuring (Narrative) (Details)	3 Months Ended	12 Months Ended
	Aug. 03, 2019 USD ($)	Feb. 01, 2020 USD ($)	Feb. 02, 2019 USD ($)	Feb. 03, 2018 USD ($)	Mar. 01, 2018 store
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 41,000,000	$ 46,000,000	$ 10,000,000
U.S. Operating Model [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		41,000,000
Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			47,000,000	9,000,000
Number of stores to be closed | store					257
Restructuring Reserve		0	1,000,000	8,000,000
Facility Closure And Other Costs [Member] | Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			49,000,000
Restructuring Reserve			1,000,000
Voluntary Early Retirement [Member] | U.S. Operating Model [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 10,000,000
Termination Benefits [Member] | U.S. Operating Model [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		$ 16,000,000
Termination Benefits [Member] | Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ (2,000,000)	8,000,000
Restructuring Reserve				$ 8,000,000