Summary of Significant Accounting Policies - Revenue (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Feb. 01, 2014	Feb. 02, 2013	Mar. 03, 2012
Accounting Policies [Abstract]
Sales returns reserve	$ 13	$ 14
Term of Extended Warranties, Low End of Range	3 months
Term of Extended Warranties, High End of Range	4 years
Percentage of Commissions on Sale of Extended Warranties to Revenue	2.10%	2.40%	2.40%
Deferred revenue	399	451
Deferred revenue, noncurrent	$ 50	$ 62

This element represents the percentage of commissions from sale of extended warranties to revenue.

No definition available.

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

- Definition

The carrying value of the sales returns reserve as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	bby_RevenueRecognitionSalesReturnsReserve
Namespace Prefix:	bby_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the maximum period of extended warranties.

+ References

No definition available.

+ Details

Name:	bby_TermOfExtendedWarrantiesHighEndOfRange
Namespace Prefix:	bby_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the minimum period of extended warranties.

+ References

No definition available.

+ Details

Name:	bby_TermOfExtendedWarrantiesLowEndOfRange
Namespace Prefix:	bby_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 8

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

+ Details

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

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

+ Details

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