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Fair Value Measurements - Impairments (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Continuing Operations [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property and equipment, impairments $ 42us-gaap_AssetImpairmentCharges
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Total impairments 43us-gaap_RestructuringSettlementAndImpairmentProvisions
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Total remaining net carrying value 19us-gaap_AssetsFairValueDisclosure
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Discontinued Operations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impairment of Long-Lived Assets to be Disposed of   175us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property and equipment, impairments 1us-gaap_AssetImpairmentCharges
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Property and equipment, remaining net carrying value 0us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
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Discontinued Operations [Member] | Trade Names [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Tradename, impairments 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
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Property and equipment write-downs [Member] | Continuing Operations [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property and equipment, impairments 1us-gaap_AssetImpairmentCharges
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Investments Impairment Charge Related to Restructuring [Member] | Continuing Operations [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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[1] Remaining net carrying value approximates fair value.
[2] Includes the $175 million impairment to write down the book value of our investment in Best Buy Europe to fair value. Upon completion of the sale of Best Buy Europe as described in Note 2, Discontinued Operations, the remaining net carrying values of all assets have been reduced to zero.
[3] Property and equipment and tradename impairments associated with discontinued operations are recorded within loss from discontinued operations in our Consolidated Statements of Earnings.
[4] See Note 4, Restructuring Charges, for additional information.