Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Oct. 29, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Foreign currency translation adjustments	$ (19)	$ (2)	$ 6	$ (19)
Reclassification of foreign currency translation adjustments into earnings due to sale of business	0	0	0	(67)
Foreign Currency Translation, Ending Balance	277	296	277	296
Best Buy Co., Inc. [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation, Beginning Balance	$ 296	$ 298	$ 271	382
Reclassification of foreign currency translation adjustments into earnings due to sale of business				$ (67)

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

+ References

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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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