The contract term in months, for derivatives not designated as hedging instruments.

No definition available.

Name:	bby_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsContractTerm1
Namespace Prefix:	bby_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- Definition

The net cash inflow (gross proceeds less cash consideration paid at closing) associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

No definition available.

+ Details

Name:	bby_NetProceedsFromDivestitureOfBusinesses
Namespace Prefix:	bby_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Definition

Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

+ Details

Name:	us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Summary of Significant Accounting Policies - Derivatives (Details) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended	11 Months Ended	12 Months Ended
	Feb. 01, 2014 GBP (£)	Feb. 01, 2014 Not Designated as Hedging Instrument [Member] Discontinued Operations [Member] GBP (£)	Feb. 01, 2014 Not Designated as Hedging Instrument [Member] Continuing Operations [Member] USD ($)	Feb. 02, 2013 Not Designated as Hedging Instrument [Member] Continuing Operations [Member] USD ($)	Feb. 01, 2014 Operating Expense [Member] Discontinued Operations [Member] USD ($)	Feb. 02, 2013 Operating Expense [Member] Continuing Operations [Member] USD ($)	Feb. 01, 2014 Operating Expense [Member] Continuing Operations [Member] USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Contract Term 1	12 months
Derivative, Notional Amount		£ 455	$ 157	$ 173
Net Proceeds from Divestiture of Businesses	471
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments					$ 2	$ 2	$ 5