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Revenue Recognition Change in Contract with Customer (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 04, 2018 | Feb. 03, 2018
Revenue from Contract with Customer [Abstract] |  |
Contract with Customer, Liability, Revenue Recognized |  | $ 605
Contract with Customer, Liability, Revenue Adjustments | $ 1 |

X
- Definition Amount of revenue recognized related to changes in the measure of progress, changes in the estimate of the transaction price or contract modifications. + References No definition available. + Details
Name: | bby_ContractwithCustomerLiabilityRevenueAdjustments
Namespace Prefix: | bby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration