Discontinued Operations (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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue											$ 2		$ 411	$ 525
Restructuring charges											(2)		229	75
Gain (loss) from discontinued operations before income tax benefit											3		(406)	(260)
Income tax benefit (expense)											(2)		89	57
Gain on disposal of discontinued operations											0		9	7
Income tax benefit on sale											0		0	8
Net gain (loss) from discontinued operations including noncontrolling interests	(6)	(43)	(2)	6	0	(9)	(108)	(127)	(37)	(36)	1	(295)	(308)	(188)
Net loss from discountinued operations attributable to noncontrolling interests											1	130	134	38
Net gain (loss) from discontinued operations attributable to Best Buy Co., Inc.											2		(174)	(150)
Domestic [Member] | Speakeasy [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal of discontinued operations									7
International [Member] | Best Buy China [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores closed							8
International [Member] | Best Buy Turkey [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores closed					2
Gain on disposal of discontinued operations					4
International [Member] | Best Buy U.K. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores closed			11
International [Member] | Belgium [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores sold			82
Gain on disposal of discontinued operations													$ 5