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Debt (Narrative) (Long-Term Debt) (Details) - USD ($) $ in Millions | Nov. 02, 2019 | Feb. 02, 2019 | Nov. 03, 2018
--- | --- | --- | ---
Debt [Abstract] |  |  |
Long-term Debt, Fair Value | $ 1,288 | $ 1,178 | $ 1,133
Carrying value | $ 1,220 | $ 1,175 | $ 1,128

X
- Definition Long-term debt, excluding debt discounts and issuance costs and financing and capital lease obligations + References No definition available. + Details
Name: | bby_LongTermDebtExcludingDebtDiscountsAndIssuanceCostsAndFinancingAndCapitalLeaseObligations
Namespace Prefix: | bby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant