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Summary of Significant Accounting Policies - Revenue (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Accounting Policies [Abstract]      
Sales returns reserve $ 25bby_RevenueRecognitionSalesReturnsReserve $ 13bby_RevenueRecognitionSalesReturnsReserve  
Term of Extended Warranties, Low End of Range 3 months    
Term of Extended Warranties, High End of Range 4 years    
Percentage of Commissions on Sale of Extended Warranties to Revenue 2.10%bby_PercentageOfCommissionsOnSaleOfExtendedWarrantiesToRevenue 2.20%bby_PercentageOfCommissionsOnSaleOfExtendedWarrantiesToRevenue 2.50%bby_PercentageOfCommissionsOnSaleOfExtendedWarrantiesToRevenue
Deferred Revenue, Current, Including Held-for-Sale 376bby_DeferredRevenueCurrentIncludingHeldforSale    
Deferred revenue 326us-gaap_DeferredRevenueCurrent 399us-gaap_DeferredRevenueCurrent  
Disposal Group, Including Discontinued Operation, Deferred Revenue, Current 50us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredRevenueCurrent    
Deferred revenue, noncurrent $ 49us-gaap_DeferredRevenueNoncurrent $ 50us-gaap_DeferredRevenueNoncurrent