Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 01, 2015	Aug. 02, 2014	Aug. 01, 2015	Aug. 02, 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	$ 0	$ 0	(67)	$ 0
Unrealized gains (losses) on available-for-sale investments	0	0	0	(1)
Foreign Currency Translation, Ending Balance	298		298
Total, Ending Balance	298	494	298	494
Best Buy Co., Inc. [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation, Beginning Balance	330		382	485
Available-For-Sale Investments, Beginning Balance				7
Total, Beginning Balance	330		382	492
Foreign currency translation adjustments	(32)		(17)	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	298	488	298	488
Available-For-Sale Investments, Ending Balance		6		6
Total, Ending Balance	$ 298	$ 494	$ 298	$ 494