Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Total, Beginning Balance			$ 382
Foreign currency translation adjustments	$ (2)	$ (25)	(19)	$ (22)
Reclassification of foreign currency translation adjustments into earnings due to sale of business	0	0	(67)	0
Unrealized losses on available-for-sale investments	0	(1)	0	(2)
Foreign Currency Translation, Ending Balance	296	463	296	463
Available-For-Sale Investments, Ending Balance		5		5
Total, Ending Balance	296	468	296	468
Best Buy Co., Inc. [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation, Beginning Balance	298	488	382	485
Available-For-Sale Investments, Beginning Balance		6		7
Total, Beginning Balance	298	494	382	492
Foreign currency translation adjustments	(2)	(25)	(19)	(22)
Reclassification of foreign currency translation adjustments into earnings due to sale of business			(67)
Unrealized losses on available-for-sale investments		(1)		(2)
Total, Ending Balance	$ 296	$ 468	$ 296	$ 468