Document Information Statement - shares	3 Months Ended
	May 04, 2019	Jun. 05, 2019
Document Information [Abstract]
Entity Common Stock, Shares Outstanding		267,043,142
Entity Registrant Name	BEST BUY CO INC
Entity Central Index Key	0000764478
Document Type	10-Q
Document Period End Date	May 04, 2019
Amendment Flag	false
Trading Symbol	bby
Current Fiscal Year End Date	--02-01
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1