Fiscal Year-End Change (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended								11 Months Ended		12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Feb. 02, 2013	Nov. 03, 2012	Aug. 04, 2012	May 05, 2012	Mar. 03, 2012	Nov. 26, 2011	Aug. 27, 2011	May 28, 2011	Feb. 02, 2013	Jan. 28, 2012	Mar. 03, 2012	Feb. 26, 2011
Fiscal Year-End Change [Abstract]
Revenues	$ 628	$ 732
Gross profit	133	166	3,781	2,586	2,564	2,907	4,057	2,922	2,848	2,746	10,649	11,352	12,573	12,541
Operating Income (Loss)	(16)	20	(145)	12	33	262	69	351	335	330	(125)	772	1,085	2,374
Net earnings (loss) from continuing operations	(19)	15	(377)	(5)	(7)	161	(324)	258	197	199	(421)	118	330	1,554
Loss from discontinued operations, net of tax	(6)	(43)	(2)	6	0	(9)	(108)	(127)	(37)	(36)	1	(295)	(308)	(188)
Net earnings (loss) including noncontrolling interests	(25)	(28)	(379)	1	(7)	152	(432)	131	160	163	(420)	(177)	22	1,366
Net earnings (loss) attributable to Best Buy Co., Inc. shareholders	(14)	(33)	(409)	(10)	12	158	(1,698)	154	177	136	(441)	(1,425)	(1,231)	1,277
Adjustment for Fiscal Year-End Change (Note 2)	74	5									(74)	(5)	0	0
Fiscal Year Change, Adjustments to Cash Flows, Financing Activities	50
Fiscal Year Change, Adjustment to Cash Flows, Investing Activities	$ 18