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Income Taxes - Tax Credit and Operating Loss Carryforwards (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Tax Credit Carryforward [Line Items]    
Valuation allowance $ 143us-gaap_DeferredTaxAssetsValuationAllowance $ 158us-gaap_DeferredTaxAssetsValuationAllowance
Decrease in the valuation allowance, related to the international net operating loss carryforwards and other international deferred tax assets (15)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Unremitted earnings of foreign operations 770us-gaap_UndistributedEarningsOfForeignSubsidiaries  
State [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforwards 12us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Tax credit carryforwards, valuation allowance 6us-gaap_TaxCreditCarryforwardValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Capital Loss Carryforwards [Member] | State [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforwards 4us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_CapitalLossCarryforwardMember		  
Capital Loss Carryforwards [Member] | U.S. and State [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforwards, valuation allowance 11us-gaap_TaxCreditCarryforwardValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= bby_DomesticTaxandStateAuthorityMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_CapitalLossCarryforwardMember		  
Federal [Member] | U.S. [Member]    
Tax Credit Carryforward [Line Items]    
Total net operating loss carryforwards 21us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_InternalRevenueServiceIRSMember		  
Federal [Member] | Foreign Tax Credit Carryforwards [Member] | U.S. [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforwards 1us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_InternalRevenueServiceIRSMember
/ us-gaap_TaxCreditCarryforwardAxis
= bby_ForeignTaxCreditMember		  
Tax credit carryforwards, valuation allowance 1us-gaap_TaxCreditCarryforwardValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_InternalRevenueServiceIRSMember
/ us-gaap_TaxCreditCarryforwardAxis
= bby_ForeignTaxCreditMember		  
International [Member]    
Tax Credit Carryforward [Line Items]    
Total net operating loss carryforwards 118us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementBusinessSegmentsAxis
= bby_InternationalMember		  
Net operating loss carryforwards subject to expiration 110us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_StatementBusinessSegmentsAxis
= bby_InternationalMember		  
Net operating loss carryforwards, valuation allowance $ 125us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_StatementBusinessSegmentsAxis
= bby_InternationalMember