Contingencies and Commitments (Details 2) (Best Buy Europe [Member], USD $) In Millions, unless otherwise specified	Nov. 26, 2011
Best Buy Europe [Member]
Commitments [Line Items]
Purchase price for profit share-based management fee buyout, pending CPW shareholder approval	$ 1,300

Purchase Price For Profit Share-Based Management Fee Buyout, Pending Shareholder Approval

No definition available.

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