Document Information Statement - shares	9 Months Ended
	Nov. 03, 2018	Dec. 05, 2018
Document Information [Abstract]
Entity Common Stock, Shares Outstanding		269,101,569
Entity Registrant Name	BEST BUY CO INC
Entity Central Index Key	0000764478
Document Type	10-Q
Document Period End Date	Nov. 03, 2018
Amendment Flag	false
Current Fiscal Year End Date	--02-02
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3