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Derivative Instruments Changes in Fair Value Hedges on Income (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
May 02, 2015
Derivative Instruments, Gain (Loss) [Line Items]  
Net impact on Consolidated Statements of Earnings $ 0us-gaap_DerivativeGainLossOnDerivativeNet
Interest Rate Swap [Member] | Interest Expense [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Interest rate swap gain 4us-gaap_DerivativeGainOnDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
Debt [Member] | Interest Rate Swap [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Long-term debt loss $ (4)us-gaap_DerivativeLossOnDerivative
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ bby_HedgedItemAxis
= us-gaap_DebtMember