Contingencies Contingencies (Details) (Pending or Threatened Litigation [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
Dec. 31, 2012	Nov. 30, 2012
Pending or Threatened Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Settlement Agreement Consideration, Plaintiff Amount	$ 5	$ 22

Represents the amount of settlement payment to be made to plaintiffs as per proposed settlement terms.

No definition available.

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