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Income Taxes - Components of Deferreds (Details) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2015
Feb. 01, 2014
Components of deferred tax assets and liabilities    
Accrued property expenses $ 129bby_DeferredTaxAssetsTaxDeferredExpenseReserveAndAccrualsPropertyExpenses $ 162bby_DeferredTaxAssetsTaxDeferredExpenseReserveAndAccrualsPropertyExpenses
Other accrued expenses 91us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 133us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Deferred revenue 93us-gaap_DeferredTaxAssetsDeferredIncome 81us-gaap_DeferredTaxAssetsDeferredIncome
Compensation and benefits 103us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 114us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Stock-based compensation 94us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 110us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Deferred Tax Assets, Goodwill and Intangible Assets 287us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets  
Loss and credit carryforwards 156us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 176us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other 88us-gaap_DeferredTaxAssetsOther 103us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 1,041us-gaap_DeferredTaxAssetsGross 879us-gaap_DeferredTaxAssetsGross
Valuation allowance (143)us-gaap_DeferredTaxAssetsValuationAllowance (158)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets after valuation allowance 898us-gaap_DeferredTaxAssetsNet 721us-gaap_DeferredTaxAssetsNet
Property and equipment (251)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (286)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Goodwill and intangibles 0us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (75)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Inventory (54)bby_DeferredTaxLiabilitiesInventory (60)bby_DeferredTaxLiabilitiesInventory
Other (27)us-gaap_DeferredTaxLiabilitiesOther (16)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (332)us-gaap_DeferredIncomeTaxLiabilities (437)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets 566us-gaap_DeferredTaxAssetsLiabilitiesNet 284us-gaap_DeferredTaxAssetsLiabilitiesNet
Other current assets 252us-gaap_DeferredTaxAssetsNetCurrent 261us-gaap_DeferredTaxAssetsNetCurrent
Deferred Tax Assets, Net of Valuation Allowance, Current, Held-for-Sale 3bby_DeferredTaxAssetsNetofValuationAllowanceCurrentHeldforSale  
Other assets 322us-gaap_DeferredTaxAssetsNetNoncurrent 44us-gaap_DeferredTaxAssetsNetNoncurrent
Other current liabilities 0us-gaap_DeferredTaxLiabilitiesCurrent 0us-gaap_DeferredTaxLiabilitiesCurrent
Other long-term liabilities 0us-gaap_DeferredTaxLiabilitiesNoncurrent (21)us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred Tax Liabilities, Net, Noncurrent, Held-for-Sale (11)bby_DeferredTaxLiabilitiesNetNoncurrentHeldforSale  
Net deferred tax assets $ 566us-gaap_DeferredTaxAssetsLiabilitiesNet $ 284us-gaap_DeferredTaxAssetsLiabilitiesNet