Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Aug. 02, 2014	Aug. 03, 2013	Aug. 02, 2014	Aug. 03, 2013
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Total, Beginning Balance			$ 492
Reclassification of foreign currency translation adjustments into earnings due to sale of business	0	654	0	654
Unrealized gains (losses) on available-for-sale investments	0	(3)	(1)	0
Reclassification of losses on available-for-sale investments into earnings	0	2	0	2
Total, Ending Balance	494	529	494	529
Best Buy Co., Inc. [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation, Beginning Balance		80	485	113
Available-For-Sale Investments, Beginning Balance		2	7	(1)
Total, Beginning Balance		82	492	112
Foreign currency translation adjustments		(60)	3	(93)
Reclassification of foreign currency translation adjustments into earnings due to sale of business		508		508
Unrealized gains (losses) on available-for-sale investments		(2)	(1)	1
Reclassification of losses on available-for-sale investments into earnings		1		1
Foreign Currency Translation, Ending Balance	488	528	488	528
Available-For-Sale Investments, Ending Balance	6	1	6	1
Total, Ending Balance	$ 494	$ 529	$ 494	$ 529

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 of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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

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