Income Taxes (Details) - 6 months ended Aug. 01, 2015 - USD ($) $ in Millions	Total
Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Expense (Benefit), Tax Election	$ (353)
Effective Income Tax Rate Reconciliation, Percent, without Tax Election	36.80%

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