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Long Term Debt (Details) (USD $)
In Millions, unless otherwise specified
May 02, 2015
Jan. 31, 2015
May 03, 2014
Long-term Debt      
Total long-term debt $ 1,607us-gaap_LongTermDebt $ 1,621us-gaap_LongTermDebt $ 1,648us-gaap_LongTermDebt
Less: current portion (383)us-gaap_LongTermDebtCurrent [1] (41)us-gaap_LongTermDebtCurrent (44)us-gaap_LongTermDebtCurrent
Total long-term debt, less current portion 1,224us-gaap_LongTermDebtAndCapitalLeaseObligations 1,580us-gaap_LongTermDebtAndCapitalLeaseObligations 1,604us-gaap_LongTermDebtAndCapitalLeaseObligations
Long-term Debt, Fair Value 1,671us-gaap_LongTermDebtFairValue 1,677us-gaap_LongTermDebtFairValue 1,705us-gaap_LongTermDebtFairValue
2016 Notes [Member]      
Long-term Debt      
Total long-term debt 350us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_NotesDue2016Member
349us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_NotesDue2016Member
349us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_NotesDue2016Member
2018 Notes [Member]      
Long-term Debt      
Total long-term debt 500us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_Notesdue2018Member
500us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_Notesdue2018Member
500us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_Notesdue2018Member
2021 Notes [Member]      
Long-term Debt      
Total long-term debt 649us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_NotesDue2021Member
649us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_NotesDue2021Member
649us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_NotesDue2021Member
Interest Rate Swap [Member]      
Long-term Debt      
Total long-term debt 5us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_InterestRateSwapMember
1us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_InterestRateSwapMember
 
Financing Lease Obligations [Member]      
Long-term Debt      
Total long-term debt 60us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_FinancingLeaseObligationsMember
69us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_FinancingLeaseObligationsMember
90us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_FinancingLeaseObligationsMember
Capital Lease Obligations [Member]      
Long-term Debt      
Total long-term debt 43us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
52us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
59us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
Other Debt [Member]      
Long-term Debt      
Total long-term debt $ 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_OtherLongTermDebtMember
$ 1us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_OtherLongTermDebtMember
$ 1us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= bby_OtherLongTermDebtMember
[1] (1)Our 2016 Notes due March 15, 2016, are classified in the current portion of long-term debt as of May 2, 2015.