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Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
11 Months Ended 12 Months Ended
Feb. 02, 2013
Jan. 31, 2015
Feb. 01, 2014
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Maximum percentage of a participant's eligible compensation that a participant may contribute annually to the plan (as a percent)   50.00%bby_RetirementSavingsPlansMaximumPercentageParticipantContributionOfEligibleCompensation  
Percentage of matching contribution made by company of first 3% of participating employees' contributions (as a percent)   100.00%bby_PercentageOfMatchingContributionMadeByCompanyOfFirstThreePercentageOfParticipatingEmployeesContribution  
Percentage of participating employees' contribution, matched 100% (as a percent)   3.00%bby_PercentageOfParticipatingEmployeesContributionHundredPercentMatched  
Percentage of matching contribution made by company, of next 2% of participating employees' contributions (as a percent)   50.00%bby_PercentageOfMatchingContributionMadeByCompanyOfNextTwoPercentageOfParticipatingEmployeesContribution  
Percentage of participating employees' contribution, matched 50% (as a percent)   2.00%bby_PercentageOfParticipatingEmployeesContributionFiftyPercentMatched  
Defined Contribution Plan, Cost Recognized $ 62us-gaap_DefinedContributionPlanCostRecognized $ 60us-gaap_DefinedContributionPlanCostRecognized $ 65us-gaap_DefinedContributionPlanCostRecognized
Non-qualified, unfunded deferred compensation plan [Member]      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Deferred Compensation Liability, Classified, Noncurrent   44us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= bby_NonQualifiedUnfundedDeferredCompensationPlanMember
54us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= bby_NonQualifiedUnfundedDeferredCompensationPlanMember
Deferred Compensation Plan Assets   $ 97us-gaap_DeferredCompensationPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= bby_NonQualifiedUnfundedDeferredCompensationPlanMember
$ 96us-gaap_DeferredCompensationPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= bby_NonQualifiedUnfundedDeferredCompensationPlanMember