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Goodwill and Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
May 02, 2015
May 03, 2014
Jan. 31, 2015
Goodwill [Roll Forward]      
Goodwill, Balance at the beginning of the period $ 425us-gaap_Goodwill    
Goodwill, Balance at the end of the period 425us-gaap_Goodwill 425us-gaap_Goodwill  
Indefinite-lived Tradenames [Roll Forward]      
Indefinite-lived Tradenames, Beginning balance 57us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 101us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill  
Indefinite-lived Intangible Assets, Translation Adjustments 1us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments (1)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments  
Indefinite-lived Tradenames, Impairments (40)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill [1]    
Indefinite-lived Tradenames, Ending balance 18us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 100us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill  
Gross amount of goodwill and the accumulated goodwill impairment losses      
Gross Carrying Amount 1,100us-gaap_GoodwillGross [2] 1,308us-gaap_GoodwillGross 1,100us-gaap_GoodwillGross [2]
Cumulative Impairment (675)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss [2] (883)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (675)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss [2]
Domestic [Member]      
Goodwill [Roll Forward]      
Goodwill, Balance at the beginning of the period 425us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
425us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
 
Goodwill, Changes in foreign currency exchange rates 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
   
Goodwill, Impairments 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
   
Goodwill, Balance at the end of the period 425us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
425us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
 
Indefinite-lived Tradenames [Roll Forward]      
Indefinite-lived Tradenames, Beginning balance 18us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
19us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
 
Indefinite-lived Intangible Assets, Translation Adjustments 0us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
0us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
 
Indefinite-lived Tradenames, Impairments 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
   
Indefinite-lived Tradenames, Ending balance 18us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
19us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_DomesticSegmentMember
 
International [Member]      
Indefinite-lived Tradenames [Roll Forward]      
Indefinite-lived Tradenames, Beginning balance 39us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_InternationalSegmentMember
82us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_InternationalSegmentMember
 
Indefinite-lived Intangible Assets, Translation Adjustments 1us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= bby_InternationalSegmentMember
(1)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= bby_InternationalSegmentMember
 
Indefinite-lived Tradenames, Impairments (40)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_InternationalSegmentMember
[1]    
Indefinite-lived Tradenames, Ending balance $ 0us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_InternationalSegmentMember
$ 81us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= bby_InternationalSegmentMember
 
[1] Represents the Future Shop tradename impaired as a result of the Canadian brand consolidation in the first quarter of fiscal 2016. See Note 5, Restructuring Charges, for further discussion of the Canadian brand consolidation.
[2] Excludes the gross carrying amount and cumulative impairment related to Five Star, which was held for sale at January 31, 2015. The sale was completed on February 13, 2015.