Document and Entity Information Document	9 Months Ended
	Nov. 03, 2012	Nov. 30, 2012
Document Information [Line Items]
Entity Registrant Name	BEST BUY CO INC
Current Fiscal Year End Date	--02-02
Document Fiscal Year Focus	2013
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		338,087,851
Document Fiscal Period Focus	Q3
Document Type	10-Q
Entity Central Index Key	0000764478
Document Period End Date	Nov. 03, 2012
Entity Filer Category	Large Accelerated Filer