Income Taxes (Notes)	9 Months Ended
Income Taxes (Notes)	Nov. 01, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes As disclosed in Note 3, Profit Share Buy-Out, in the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended February 1, 2014, in the fourth quarter of fiscal 2012, we purchased CPW’s interest in the Best Buy Mobile profit share agreement for $1.3 billion (the “Mobile buy-out”). The Mobile buy-out completed by our U.K. subsidiary resulted in the $1.3 billion purchase price being assigned, for U.S. tax purposes only, to an intangible asset. The Mobile buy-out did not, however, result in a similar intangible asset in the U.K., as the Mobile buy-out was considered part of a tax-free equity transaction for U.K. tax purposes. Because the U.S. tax basis in the intangible asset was considered under U.S. tax law to be held by our U.K. subsidiary, which is regarded as a foreign corporation for U.S. tax purposes, ASC 740, Income Taxes, requires that no deferred tax asset may be recorded in respect of the intangible asset. ASC 740-30-25-9 also precludes the recording of a deferred tax asset on the outside basis difference of the U.K. subsidiary. As a result, the amortization of the U.S. tax basis in the intangible asset only resulted in a periodic income tax benefit by reducing the amount of the U.K. subsidiary’s income, if any, that would otherwise have been subject to U.S. income taxes. In the first quarter of fiscal 2015, we filed an election with the Internal Revenue Service to treat the U.K. subsidiary as a disregarded entity such that its assets are now deemed to be assets held directly by a U.S. entity for U.S. tax purposes. This tax-only election, which results in the liquidation of the U.K. subsidiary for U.S. tax purposes, resulted in the elimination of the Company’s outside basis difference in the U.K. subsidiary. Additionally, the election resulted in the recognition of a deferred tax asset (and corresponding income tax benefit) for the remaining unrecognized inside tax basis in the intangible, in a manner similar to a change in tax status as provided in ASC 740-10-25-32. Our effective tax rate for the first nine months of fiscal 2015 was (22.9)%, compared to 40% in the prior year period. Without the impact of the election described above, which contributed to an income tax benefit of $353 million, the effective tax rate for the first nine months of fiscal 2015 would have been 37.9%. The 37.9% effective tax rate was lower than the prior year primarily due to the favorable resolution of certain tax matters in the current year period, partially offset by the unfavorable ongoing periodic impact as a result of the election described above.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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