Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
May 02, 2015
Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Expense (Benefit), Tax Election	$ (353)bby_IncomeTaxExpenseBenefitTaxElection
Effective Income Tax Rate Reconciliation, Percent, without Tax Election	39.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations, without tax election

No definition available.

Name:	bby_EffectiveIncomeTaxRateReconciliationPercentwithoutTaxElection
Namespace Prefix:	bby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration