Assets and Liabilities Held for Sale and Discontinued Operations (Details) In Millions, unless otherwise specified	3 Months Ended
	May 04, 2013 USD ($)	May 04, 2013 GBP (£)	May 05, 2012 USD ($)	May 04, 2013 Segment, Discontinued Operations [Member] USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Proceeds from Divestiture of Businesses	$ 733	£ 471
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	28
Proceeds from Divestiture of Businesses		500
Cash Consideration Paid at Closing	29
Revenue	1,430		1,244
Restructuring charges	53		6
Loss from discontinued operations before income tax benefit (expense)	(185)		(19)
Income tax benefit (expense)	(13)		4
Gain on sale of discontinued operations	28		0
Equity in loss of affiliates	0		(2)
Net loss from discontinued operations, including noncontrolling interests	(170)		(17)
Net (earnings) loss from discontinued operations attributable to noncontrolling interests	(8)		6
Net loss from discontinued operations attributable to Best Buy Co., Inc. shareholders	(178)		(11)
Impairment of Long-Lived Assets to be Disposed of	$ 175		$ 0	$ 175