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Shareholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 11 Months Ended 12 Months Ended
Feb. 02, 2013
Jan. 31, 2015
Feb. 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized under the Omnibus Plan (in shares)   22,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized  
Number of shares available for future grants under the Omnibus Plan (in shares)   22,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Stock-based compensation expense (in dollars) $ 112us-gaap_AllocatedShareBasedCompensationExpense $ 87us-gaap_AllocatedShareBasedCompensationExpense $ 97us-gaap_AllocatedShareBasedCompensationExpense
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at the beginning of the period (in shares)   22,101,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Granted (in shares)   1,524,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod  
Exercised (in shares)   (1,679,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Forfeited/Canceled (in shares)   (4,604,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod  
Outstanding at the end of the period (in shares)   17,342,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 22,101,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Vested or expected to vest at the end of the period (in shares)   17,095,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber  
Exercisable at the end of the period (in shares)   13,995,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Weighted Average Exercise Price [Roll Forward]      
Outstanding at the beginning of the period (in dollars per share)   $ 36.38us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Granted (in dollars per share)   $ 29.90us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice  
Exercised (in dollars per share)   $ 25.31us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice  
Forfeited/Canceled (in dollars per share)   $ 36.62us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice  
Outstanding at the end of the period (in dollars per share)   $ 36.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 36.38us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Vested or expected to vest at the end of the period (in dollars per share)   $ 36.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice  
Exercisable at the end of the period (in dollars per share)   $ 39.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Weighted Average Remaining Contractual Term, Years [Abstract]      
Outstanding at the end of the period (in years)   4 years 11 months  
Vested or expected to vest at the end of the period (in years)   4 years 10 months  
Exercisable at the end of the period (in years)   4 years  
Aggregate Intrinsic Value [Abstract]      
Outstanding at the end of the period (in dollars)   67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue  
Vested or expected to vest at the end of the period (in dollars)   66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue  
Exercisable at the end of the period (in dollars)   36us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1  
Weighted-average grant-date fair value of stock options granted (in dollars per share) $ 5.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 9.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 7.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Aggregate intrinsic value of stock options exercised (in dollars) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Net cash proceeds from the exercise of stock options (in dollars) 1us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 42us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 158us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
Actual income tax benefit realized from stock option exercises (in dollars) 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 5us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 13us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate low end of the range (as a percent) 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum [1],[2] 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum [1],[2] 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum [1],[2]
Risk-free interest rate high end of the range (as a percent) 2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum [1],[2] 2.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum [1],[2] 1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum [1],[2]
Expected dividend yield (as a percent) 2.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate [2] 2.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate [2] 2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate [2]
Expected stock price volatility (as a percent) 44.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [2],[3] 40.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [2],[3] 46.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [2],[3]
Expected life of stock options (in years) 5 years 10 months 24 days [2],[4] 6 years [2],[4] 5 years 10 months 24 days [2],[4]
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of stock options (in years)   10 years  
Vesting period (in years)   4 years  
Stock-based compensation expense (in dollars) 43us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 17us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 25us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Aggregate Intrinsic Value [Abstract]      
Unrecognized compensation (in dollars)   19us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		  
Weighted-average period over which compensation expense is expected to be recognized (in years)   1 year 2 months  
Market-based [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense (in dollars) 2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		 10us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		 9us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember
Aggregate Intrinsic Value [Abstract]      
Unrecognized compensation (in dollars)   20us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		  
Weighted-average period over which compensation expense is expected to be recognized (in years)   1 year 11 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at the beginning of the period (in shares)   1,636,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		  
Granted (in shares)   564,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		  
Vested (in shares)   (127,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		  
Forfeited/Canceled (in shares)   (369,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		  
Outstanding at the end of the period (in shares)   1,704,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		 1,636,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember
Weighted Average Fair Value Per Share [Roll Forward]      
Outstanding at the beginning of the period (in dollars per share)   $ 20.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		  
Granted (in dollars per share)   $ 29.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		  
Vested (in dollars per share)   $ 19.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		  
Forfeited/Canceled (in dollars per share)   $ 19.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		  
Outstanding at the end of the period (in dollars per share)   $ 24.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember		 $ 20.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_MarketBasedShareAwardsMember
Time-based [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Award, Award Vesting Period, Minimum   3 years  
Share-based Payment Award, Award Vesting Period, Maximum   4 years  
Vesting percentage per increment, options vesting in annual increments   25% of the award vests on the date of grant and 25% vests on each of the three anniversary dates thereafter  
Annual vesting percentage, options vesting in annual increments   25.00%bby_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsAnnualVestingPercentage
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		  
Stock-based compensation expense (in dollars) 62us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		 60us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		 62us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember
Aggregate Intrinsic Value [Abstract]      
Unrecognized compensation (in dollars)   84us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		  
Weighted-average period over which compensation expense is expected to be recognized (in years)   1 year 11 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Outstanding at the beginning of the period (in shares)   7,065,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		  
Granted (in shares)   2,609,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		  
Vested (in shares)   (2,657,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		  
Forfeited/Canceled (in shares)   (1,474,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		  
Outstanding at the end of the period (in shares)   5,543,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		 7,065,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember
Weighted Average Fair Value Per Share [Roll Forward]      
Outstanding at the beginning of the period (in dollars per share)   $ 21.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		  
Granted (in dollars per share)   $ 28.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		  
Vested (in dollars per share)   $ 22.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		  
Forfeited/Canceled (in dollars per share)   $ 20.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		  
Outstanding at the end of the period (in dollars per share)   $ 24.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember		 $ 21.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bby_TimeBasedShareAwardsMember
Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issuance of common stock under employee stock purchase plan (in shares) 1,000,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 300,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 600,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Discounted purchase rate on the market price of the stock (as a percent) 15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 5.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 5.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Stock-based compensation expense (in dollars) 5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Weighted Average Fair Value Per Share [Roll Forward]      
Amount accumulated by plan participants to purchase common stock (in dollars)   $ 1bby_EmployeeStockPurchasePlanAmountAccumulatedByPlanParticipants
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 $ 2bby_EmployeeStockPurchasePlanAmountAccumulatedByPlanParticipants
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
[1] Based on the U.S. Treasury constant maturity interest rate whose term is consistent with the expected life of our stock options.
[2] Forfeitures are estimated using historical experience and projected employee turnover.
[3] In projecting expected stock price volatility, we consider both the historical volatility of our stock price as well as implied volatilities from exchange-traded options on our stock.
[4] We estimate the expected life of stock options based upon historical experience.