Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Mar. 03, 2012	May 04, 2013	May 05, 2012
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Total, Beginning Balance		$ 112
Foreign currency translation adjustments		(63)	43
Unrealized losses on available-for-sale investments		3	1
Total, Ending Balance		82	98
Best Buy Co., Inc. [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Foreign Currency Translation, Beginning Balance	78	113	78
Available-For-Sale Investments, Beginning Balance	(4)	(1)	(4)
Total, Beginning Balance	74	112	74
Foreign currency translation adjustments	(15)	(33)	23
Unrealized losses on available-for-sale investments	(1)	3	1
Total, Adjustment for fiscal year change	(16)
Foreign Currency Translation, Ending Balance	93	80	101
Available-For-Sale Investments, Ending Balance	(3)	2	(3)
Total, Ending Balance	$ 90	$ 82	$ 98