Restructuring (Narrative) (Details)	3 Months Ended			12 Months Ended
	Jan. 30, 2021 USD ($)	Oct. 31, 2020 USD ($)	Aug. 03, 2019 USD ($)	Jan. 30, 2021 USD ($)	Feb. 01, 2020 USD ($)	Feb. 02, 2019 USD ($)	Mar. 18, 2018 store
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 254,000,000	$ 41,000,000	$ 46,000,000
U.S. Operating Model [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0			0
Cumulative Amount	41,000,000			41,000,000
Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative Amount	56,000,000			56,000,000
Best Buy Mobile [Member] | Domestic [Member]
Restructuring Cost and Reserve [Line Items]
Number of stores to be closed | store							257
Facility Closure Costs [Member] | Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative Amount	49,000,000			49,000,000
Voluntary Early Retirement [Member] | U.S. Operating Model [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 10,000,000
Termination Benefits [Member] | Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative Amount	6,000,000			6,000,000
Termination Benefits [Member] | Mexico Exit And Corporate Reorganization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	87,000,000	$ 46,000,000
Restructuring Reserve	124,000,000			124,000,000
Asset Impairment [Member] | Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative Amount	$ 1,000,000			$ 1,000,000