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Repurchase of Common Stock (Narrative) (Details) - February 2019 Share Repurchase Program [Member] - USD ($) $ in Billions | Oct. 31, 2020 | Feb. 23, 2019
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Stock Repurchases [Line Items] |  |
Stock Repurchase Program, Authorized Amount | $ 3.0 | $ 3.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 1.9 |

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- Definition [Line Items] for Stock Repurchases [Table] details the shares (value and share count) and average price of stock purchased during the presented periods. + References No definition available. + Details
Name: | bby_StockRepurchasesLineItems
Namespace Prefix: | bby_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | bby_ShareRepurchasesPlanAxis=bby_February2019ShareRepurchaseProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |