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Document Information Statement - USD ($)
$ in Billions
 12 Months Ended
Jan. 30, 2021
Mar. 18, 2021
Jul. 31, 2020
Document Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jan. 30, 2021    
Document Fiscal Year Focus 2021    
Current Fiscal Year End Date --01-30    
Document Transition Report false    
Entity File Number 1-9595    
Entity Registrant Name BEST BUY CO., INC.    
Entity Incorporation, State or Country Code MN    
Entity Address, Address Line One 7601 Penn Avenue South    
Entity Address, City or Town Richfield    
Entity Address, State or Province MN    
Entity Tax Identification Number 41-0907483    
Entity Address, Postal Zip Code 55423    
City Area Code 612    
Local Phone Number 291-1000    
Title of 12(b) Security Common Stock, $0.10 par value per share    
Trading Symbol BBY    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Entity Public Float     $ 20.0
Entity Common Stock, Shares Outstanding   250,044,876  
Documents Incorporated by Reference [Text Block] Portions of the registrant's Definitive Proxy Statement relating to its 2021 Regular Meeting of Shareholders ("Proxy Statement") are incorporated by reference into Part III. The Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.
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Document Fiscal Period Focus FY    
Entity Central Index Key 0000764478    
Amendment Flag false