Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 03, 2012	Aug. 03, 2013	Aug. 04, 2012	Aug. 03, 2013	Aug. 04, 2012
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation, Beginning Balance	$ 78	$ 80	$ 101	$ 113	$ 78
Available-For-Sale Investments, Beginning Balance	(4)	2	(3)	(1)	(4)
Total, Beginning Balance	74	82	98	112	74
Foreign currency translation adjustments	(15)			(104)
Reclassification of foreign currency translation adjustments into earnings		(654)	0	(654)	0
Unrealized losses on available-for-sale investments	(1)	(3)	2	0	3
Reclassification of losses on available-for-sale investments into earnings		(2)	0	(2)	0
Total, Adjustment for fiscal year change	(16)
Foreign Currency Translation, Ending Balance	93	528	87	528	87
Available-For-Sale Investments, Ending Balance	(3)	1	(1)	1	(1)
Total, Ending Balance	90	529	86	529	86
Best Buy Co., Inc. [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Foreign currency translation adjustments		(60)	(14)	(93)	9
Reclassification of foreign currency translation adjustments into earnings		508		508
Unrealized losses on available-for-sale investments		(2)	2	1	3
Reclassification of losses on available-for-sale investments into earnings		$ 1		$ 1