Document and Entity Information Document	6 Months Ended
	Aug. 03, 2013	Sep. 03, 2013
Document Information [Line Items]
Entity Registrant Name	BEST BUY CO INC
Current Fiscal Year End Date	--02-01
Document Fiscal Year Focus	2014
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		341,510,429
Document Fiscal Period Focus	Q2
Document Type	10-Q
Entity Central Index Key	0000764478
Document Period End Date	Aug. 03, 2013
Entity Filer Category	Large Accelerated Filer