Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
May 02, 2015	May 03, 2014
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Total, Beginning Balance	$ 382
Reclassification of foreign currency translation adjustments into earnings due to sale of business	(67)	0
Unrealized gains (losses) on available-for-sale investments	0	(1)
Total, Ending Balance	330	494
Best Buy Co., Inc. [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation, Beginning Balance	382	485
Available-For-Sale Investments, Beginning Balance	0	7
Total, Beginning Balance	382	492
Foreign currency translation adjustments	15	3
Reclassification of foreign currency translation adjustments into earnings due to sale of business	(67)
Unrealized gains (losses) on available-for-sale investments		(1)
Foreign Currency Translation, Ending Balance	330	488
Available-For-Sale Investments, Ending Balance	0	6
Total, Ending Balance	$ 330	$ 494

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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