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Revenue (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Feb. 01, 2020 | Feb. 02, 2019
Revenue from Contract with Customer [Line Items] |  |
Revenue recognized | $ 890 | $ 871
Minimum [Member] |  |
Revenue from Contract with Customer [Line Items] |  |
Term of contract | 1 month |
Customer loyalty program, certificate expiration period | 1 month |
Maximum [Member] |  |
Revenue from Contract with Customer [Line Items] |  |
Term of contract | 3 years |
Customer loyalty program, certificate expiration period | 5 years |

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- Definition Contract with Customer, Term of Contract + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Customer Loyalty Program, Certificate Expiration Period + References No definition available. + Details
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Namespace Prefix: | bby_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue from Contract with Customer [Line Items] + References No definition available. + Details
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Namespace Prefix: | bby_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |