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v3.19.1

Revenue Recognition (Allowance for Doubtful Accounts Related to Contracts with Customers) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
May 04, 2019 | May 05, 2018
Revenue Recognition [Abstract] |  |  |
Balances |  | $ 13 | $ 24
Charged to expenses or other accounts |  | 10 | 11
Other | [1] | (11) | (9)
Balances |  | $ 12 | $ 26
[1] | Includes bad debt write-offs, recoveries and the effect of foreign currency fluctuations.

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- Definition Valuation Allowances and Reserves, Other + References No definition available. + Details
Name: | bby_ValuationAllowancesAndReservesOther
Namespace Prefix: | bby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of accumulated credit loss for right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
Name: | us-gaap_ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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

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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
Name: | us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration