Supplementary Financial Information (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 03, 2012	Nov. 26, 2011	Aug. 27, 2011	May 28, 2011	Feb. 26, 2011	Nov. 27, 2010	Aug. 28, 2010	May 29, 2010	Mar. 03, 2012	Feb. 26, 2011	Feb. 27, 2010
Quarterly Financial Information [Line Items]
Revenue	$ 16,630	$ 12,004	$ 11,259	$ 10,812	$ 16,083	$ 11,774	$ 11,216	$ 10,674	$ 50,705	$ 49,747	$ 49,243
Comparable store sales % change (as a percent)	(2.40%)	0.30%	(2.90%)	(1.80%)	(4.70%)	(3.40%)	(0.10%)	2.90%	(1.70%)	(1.80%)
Gross profit	4,057	2,922	2,848	2,746	3,929	2,962	2,888	2,762	12,573	12,541	12,042
Operating income	69	351	335	330	1,137	433	456	348	1,085	2,374	2,368
Net earnings (loss) from continuing operations	(324)	258	197	199	792	280	274	208	330	1,554	1,495
Loss from discontinued operations, net of tax	(108)	(127)	(37)	(36)	(104)	(40)	(17)	(27)	(308)	(188)	(101)
Net earnings (loss) including noncontrolling interests	(432)	131	160	163	688	240	257	181	22	1,366	1,394
Net earnings (loss) attributable to Best Buy Co., Inc.	(1,698)	154	177	136	651	217	254	155	(1,231)	1,277	1,317
Diluted (loss) earnings per share
Continuing operations (in dollars per share)	$ (4.73)	$ 0.62	$ 0.52	$ 0.41	$ 1.84	$ 0.61	$ 0.62	$ 0.41	$ (2.89)	$ 3.44	$ 3.29
Discontinued operations (in dollars per share)	$ (0.16)	$ (0.20)	$ (0.05)	$ (0.06)	$ (0.22)	$ (0.07)	$ (0.02)	$ (0.05)	$ (0.47)	$ (0.36)	$ (0.19)
Diluted (in dollars per share)	$ (4.89)	$ 0.42	$ 0.47	$ 0.35	$ 1.62	$ 0.54	$ 0.60	$ 0.36	$ (3.36)	$ 3.08	$ 3.10
Months until inclusion in comparable store sales									14 months
Restructuring charges	35	22	1		147				288	222	52
Goodwill impairment									1,207	0	0
International [Member]
Quarterly Financial Information [Line Items]
Revenue									13,090	12,677	12,105
Operating income									(770)	320	265
Diluted (loss) earnings per share
Goodwill impairment	1,207								1,207	0
Best Buy Europe [Member]
Diluted (loss) earnings per share
Profit share agreement, buy-out price	$ 1,303								$ 1,303