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v3.19.1

Debt (Narrative) (Long-Term Debt) (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
May 04, 2019 | Feb. 02, 2019 | May 05, 2018
Debt Instrument [Line Items] |  |  |
Long-term Debt, Fair Value | $ 1,213,000,000 | $ 1,178,000,000 | $ 1,176,000,000
Carrying value | 1,173,000,000 | $ 1,175,000,000 | $ 1,140,000,000
Notes due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Extinguishment of Debt, Amount | 500,000,000 |  |
Debt Instrument, Face Amount | 500,000,000 |  |
Notes due 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 500,000,000 |  |

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

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |