Supplementary Financial Information (Details) (USD $) In Millions, except Per Share data, 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
Quarterly Financial Information [Line Items]
Revenue			$ 16,711	$ 10,753	$ 10,547	$ 11,610	$ 16,630	$ 12,004	$ 11,259	$ 10,812	$ 45,085	$ 46,064	$ 50,705	$ 49,747
Comparable store sales % change (as a percent)			(0.80%)	(4.30%)	(3.20%)	(5.30%)	(2.40%)	0.30%	(2.90%)	(1.80%)	(2.90%)		(1.70%)
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.	(14)	(33)	(409)	(10)	12	158	(1,698)	154	177	136	(441)	(1,425)	(1,231)	1,277
Diluted earnings (loss) per share
Continuing operations (in dollars per share)			$ (1.21)	$ (0.04)	$ 0.04	$ 0.47	$ (4.73)	$ 0.62	$ 0.52	$ 0.41	$ (1.31)	$ (3.38)	$ (2.89)	$ 3.44
Discontinued operations (in dollars per share)			$ 0.00	$ 0.01	$ 0.00	$ (0.01)	$ (0.16)	$ (0.20)	$ (0.05)	$ (0.06)	$ 0.01	$ (0.45)	$ (0.47)	$ (0.36)
Diluted (in dollars per share)			$ (1.21)	$ (0.03)	$ 0.04	$ 0.46	$ (4.89)	$ 0.42	$ 0.47	$ 0.35	$ (1.30)	$ (3.83)	$ (3.36)	$ 3.08
Months until inclusion in comparable store sales											14 months
Restructuring charges			203	36	91	127	35	22	1		449	280	287	222
Goodwill impairments											822	1,207	1,207	0
International [Member]
Quarterly Financial Information [Line Items]
Revenue											11,742		13,090	12,677
Operating income (loss)											(859)		(770)	320
Diluted earnings (loss) per share
Goodwill impairments							1,207				819		1,207	0
Best Buy Europe [Member]
Diluted earnings (loss) per share
Profit share agreement, buy-out price							1,303						1,303
Continuing Operations [Member]
Diluted earnings (loss) per share
Restructuring charges											$ 451		$ 58	$ 147