Discontinued Operations (Details) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended									11 Months Ended			12 Months Ended									12 Months Ended				3 Months Ended					12 Months Ended
	Jan. 31, 2012 USD ($)	Jan. 31, 2011 USD ($)	Feb. 01, 2014 USD ($)	Nov. 02, 2013 USD ($)	Aug. 03, 2013 USD ($)	Aug. 03, 2013 GBP (£)	May 04, 2013 USD ($)	Feb. 02, 2013 USD ($)	Nov. 03, 2012 USD ($)	Aug. 04, 2012 USD ($)	May 05, 2012 USD ($)	Feb. 02, 2013 USD ($)		Jan. 28, 2012 USD ($)	Feb. 01, 2014 USD ($)		Mar. 03, 2012 USD ($)		Feb. 26, 2011 USD ($)	Jun. 26, 2013 Best Buy Europe [Member] USD ($)	Feb. 01, 2014 Domestic [Member] USD ($)	Feb. 02, 2013 Domestic [Member] USD ($)	Mar. 03, 2012 Domestic [Member] USD ($)	Feb. 01, 2014 Domestic [Member] mindSHIFT [Domain] USD ($)	Feb. 01, 2014 International [Member] USD ($)	Feb. 02, 2013 International [Member] USD ($)	Mar. 03, 2012 International [Member] USD ($)	Feb. 26, 2011 International [Member] Best Buy China [Member] store	Aug. 27, 2011 International [Member] Best Buy Turkey [Member] USD ($)	Feb. 26, 2011 International [Member] Best Buy Turkey [Member] store	Nov. 26, 2011 International [Member] Best Buy U.K. [Member] store	Mar. 03, 2012 International [Member] Belgium [Member] store	Mar. 03, 2012 International [Member] Belgium [Member] USD ($)	Feb. 28, 2009 Best Buy Europe [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores closed																												8		2	11
Number of stores sold																																82
Business Acquisition, Percentage of Voting Interests Acquired																																		50.00%
Proceeds from Divestiture of Businesses					$ 526	£ 341
Dollar Amount of Shares Received from Divestiture of Business					123	80
Future Cash Consideration from Divestiture of Business, Due within One Year					39	25
Future Cash Consideration from Divestiture of Business, Due within Two Years					39	25
Interest Rate on Future Cash Consideration from Divestiture of Business					2.50%	2.50%
Cash and cash equivalents			2,678					1,826				1,826		1,401	2,678		1,199		1,103	597
Receivables, net			1,308					2,704				2,704			1,308					1,295
Merchandise inventories			5,376					6,571				6,571			5,376					554
Other current assets			900					946				946			900					168
Property, Plant and Equipment, Net			2,598					3,270				3,270			2,598		3,471			159
Other Assets			404					608				608			404					316
Assets			14,013					16,787				16,787			14,013		16,005			3,089	11,146	10,874	9,592		2,867	5,913	6,413
Accounts payable			5,122					6,951				6,951			5,122					790
Short-term debt			0					596				596			0					973
Other Liabilities, Current																				1,145
Long-Term Liabilities			976					1,109				1,109			976					65
Liabilities																				2,973
Revenue												5,259			2,815		5,658
Restructuring charges												34	[1]		100	[1]	239	[1]
Gain (loss) from discontinued operations before income tax benefit												15			(240)		(1,521)
Income tax benefit												37			42	[2]	122
Gain on sale of discontinued operations												0			32		0							(18)					4				5
Equity in loss of affiliates												(5)			0		(3)
Net gain (loss) from discontinued operations including noncontrolling interests	(12)	(28)	(17)	10	11		(170)	81	10	(37)	(17)	47	[3]	(1,394)	(166)		(1,402)
Net (earnings) loss from discontinued operations attributable to noncontrolling interests												(19)		(1,245)	11		(1,250)
Net gain (loss) from discontinued operations attributable to Best Buy Co., Inc.												28			(155)		(2,652)
Income Tax Expense (Benefit), Intraperiod Tax Allocation															27
Other Tax Expense (Benefit)															$ 15

[1] (1) See Note 6, Restructuring Charges, for further discussion of the restructuring charges associated with discontinued operations.

[2] (2)Income tax benefit for fiscal 2014 includes a $27 million benefit related to a tax allocation between continuing and discontinued operations and a $15 million benefit related to the impairment of our investment in Best Buy Europe. The fiscal 2014 effective tax rate for discontinued operations differs from the statutory tax rate primarily due to the previously mentioned tax allocation, sale of mindSHIFT, restructuring charges and the impairment of our investment in Best Buy Europe. The sale of mindSHIFT, restructuring charges and impairment generally included no related tax benefit. The deferred tax assets related to the sale of mindSHIFT and restructuring charges generally resulted in an increase in the valuation allowance in an equal amount, of which the investment impairment is not tax deductible.

[3] (4)On November 2, 2011, our Board of Directors approved a change to our fiscal year-end from the Saturday nearest the end of February to the Saturday nearest the end of January. In the first quarter of fiscal 2013 (11-month), we began reporting our quarterly results on the basis of our new fiscal year-end. As such, the results for the month of February 2012, which are included in the audited results for fiscal 2012, were also included in the reported first quarter of fiscal 2013 (11-month). However, the results for the month of February 2012 are not included in the results for the full year of fiscal 2013 (11-month). Thus, the four quarters of fiscal year 2013 (11-month) are not additive.