Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation, Beginning Balance	$ 488
Available-For-Sale Investments, Beginning Balance	6
Total, Beginning Balance			492
Reclassification of foreign currency translation adjustments into earnings due to sale of business	0	0	0	654
Unrealized gains (losses) on available-for-sale investments	(1)	1	(2)	1
Reclassification of losses on available-for-sale investments into earnings	0	0	0	2
Total, Ending Balance	468	528	468	528
Best Buy Co., Inc. [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation, Beginning Balance		528	485	113
Available-For-Sale Investments, Beginning Balance		1	7	(1)
Total, Beginning Balance		529	492	112
Foreign currency translation adjustments	(25)	(2)	(22)	(95)
Reclassification of foreign currency translation adjustments into earnings due to sale of business				508
Unrealized gains (losses) on available-for-sale investments	(1)	1	(2)	2
Reclassification of losses on available-for-sale investments into earnings				1
Foreign Currency Translation, Ending Balance	463	526	463	526
Available-For-Sale Investments, Ending Balance	5	2	5	2
Total, Ending Balance	$ 468	$ 528	$ 468	$ 528