Contingencies Contingencies (Details) (Pending Litigation [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
Dec. 31, 2012	Nov. 30, 2012
Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Settlement Agreement Consideration, Plaintiff Amount	$ 5	$ 22
Loss Contingency, Settlement Agreement Consideration, Attorneys Amount	$ 6

Represents the maximum amount of plaintiffs' attorneys' fees and costs payment made to plaintiffs' attorneys as per proposed settlement terms.

No definition available.

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