Debt Short-Term Debt (Details) - US Revolving Credit Facility, Five Year [Member] $ in Millions	May 05, 2018 USD ($)
Short-term Debt [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 1,250
Line of Credit Facility, Previous Borrowing Capacity	1,250
Long-term Line of Credit	$ 0
Debt Instrument, Basis Spread on Federal Funds Rate	0.50%
Debt Instrument, Basis Spread on Libor	1.00%
Debt Instrument, Lower Range on Annual Base Rate	0.00%
Debt Instrument, Higher Range on Annual Base Rate	0.30%
Debt Instrument, Basis Spread on Variable Rate, Low End of Range	0.80%
Debt Instrument, Basis Spread on Variable Rate, High End of Range	1.30%
Debt Instrument, Lower Range on Facility Fee	0.08%
Debt Instrument, Higher Range on Facility Fee	0.20%

Debt Instrument, Basis Spread on Federal Funds Rate

No definition available.

Name:	bby_DebtInstrumentBasisSpreadOnFederalFundsRate
Namespace Prefix:	bby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Basis Spread on Libor

+ References

No definition available.

+ Details

Name:	bby_DebtInstrumentBasisSpreadOnLibor
Namespace Prefix:	bby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The maximum percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	bby_DebtInstrumentBasisSpreadOnVariableRateHighEndOfRange
Namespace Prefix:	bby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	bby_DebtInstrumentBasisSpreadOnVariableRateLowEndOfRange
Namespace Prefix:	bby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Higher Range on Annual Base Rate

+ References

No definition available.

+ Details

Name:	bby_DebtInstrumentHigherRangeOnAnnualBaseRate
Namespace Prefix:	bby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Higher Range on Facility Fee

+ References

No definition available.

+ Details

Name:	bby_DebtInstrumentHigherRangeOnFacilityFee
Namespace Prefix:	bby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Lower Range on Annual Base Rate

+ References

No definition available.

+ Details

Name:	bby_DebtInstrumentLowerRangeOnAnnualBaseRate
Namespace Prefix:	bby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Lower Range on Facility Fee

+ References

No definition available.

+ Details

Name:	bby_DebtInstrumentLowerRangeOnFacilityFee
Namespace Prefix:	bby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Previous Borrowing Capacity

+ References

No definition available.

+ Details

Name:	bby_LineofCreditFacilityPreviousBorrowingCapacity
Namespace Prefix:	bby_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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

- 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_ShortTermDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=bby_USRevolvingCreditFacilityFiveYearMember
Namespace Prefix:
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Balance Type:
Period Type: