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Restructuring Charges - Canadian Brand Consolidation (Details) $ in Millions | 3 Months Ended
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Apr. 30, 2016 USD ($) | May. 02, 2015 USD ($) store
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges |  | $ 29 | $ 186
Restructuring Program Canadian Brand Consolidation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of stores to be closed | store |  |  | 66
Number of Future Shop stores converted to Best Buy stores | store |  |  | 65
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve, balance at the beginning of the period |  | 66 | $ 0
Restructuring charges |  | 0 | 122
Cash payments |  | (12) | (20)
Adjustments | [1] | (1) |
Restructuring Reserve, Translation Adjustment |  | 6 | 4
Restructuring reserve, balance at the end of the period |  | 59 | 106
Restructuring Program Canadian Brand Consolidation [Member] | Termination benefits [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve, balance at the beginning of the period |  | 2 | 0
Restructuring charges |  | 0 | 24
Cash payments |  | (1) | (17)
Adjustments | [1] | 0 |
Restructuring Reserve, Translation Adjustment |  | 0 | 1
Restructuring reserve, balance at the end of the period |  | 1 | 8
Restructuring Program Canadian Brand Consolidation [Member] | Facility closure and other costs [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve, balance at the beginning of the period |  | 64 | 0
Restructuring charges |  | 0 | 98
Cash payments |  | (11) | (3)
Adjustments | [1] | (1) |
Restructuring Reserve, Translation Adjustment |  | 6 | 3
Restructuring reserve, balance at the end of the period |  | 58 | 98
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges |  | (1) | 188
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges |  | (1) | 188
Restructuring and Related Cost, Cost Incurred to Date |  | 199 |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring charges |  | (1) | 188
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] | Inventory write-downs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges |  | 0 | 8
Restructuring and Related Cost, Cost Incurred to Date |  | 3 |
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] | Property and equipment impairments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges |  | 0 | 29
Restructuring and Related Cost, Cost Incurred to Date |  | 30 |
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] | Impairment of Intangible Assets Related to Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges |  | 0 | 40
Restructuring and Related Cost, Cost Incurred to Date |  | 40 |
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] | Termination benefits [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges |  | 0 | 24
Restructuring and Related Cost, Cost Incurred to Date |  | 25 |
Restructuring Program Canadian Brand Consolidation [Member] | Continuing Operations [Member] | International Segment [Member] | Facility closure and other costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges |  | (1) | $ 87
Restructuring and Related Cost, Cost Incurred to Date |  | $ 101 |
[1] | Adjustments to facility closure and other costs represent changes in sublease assumptions.

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- Definition Amount charged against earnings in the period for incurred and estimated costs, including inventory and non-inventory related costs, associated with restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted. + References No definition available. + Details
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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Amount of costs incurred to date for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of (expense) reversal of expense related to a previously accrued restructuring cost liability. Excludes adjustments for costs incurred, costs settled, and foreign currency translation adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394291&loc=d3e17658-110867 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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