Fiscal Year-End Change (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. 01, 2014		Nov. 02, 2013		Aug. 03, 2013		May 04, 2013		Feb. 02, 2013		Nov. 03, 2012		Aug. 04, 2012		May 05, 2012		Feb. 02, 2013		Jan. 28, 2012	Feb. 01, 2014		Mar. 03, 2012
Fiscal Year-End Change [Abstract]
Number of Months in Fiscal Year																				11 months
Reporting Lag for Certain Foreign Operations in Financial Statements																				1 month					2 months
Revenues	$ 189		$ 249
Gross profit	16		24	2,917		2,157		2,458		2,158		3,331		2,213		2,249		2,572		9,298	[1]	9,908	9,690		10,984
Operating Income (Loss)	(14)		(1)	469	[2]	90	[2]	413	[2]	168	[2]	(181)	[3]	0	[3]	87	[3]	263	[3]	(119)	[1],[3]	1,898	1,140	[2]	2,200
Net earnings (loss) from continuing operations	(13)		0	311		44		237		97		(460)		(9)		30		169		(467)	[1],[4]	1,217	689		1,424
Gain (loss) from discontinued operations, net of tax	(12)		(28)	(17)		10		11		(170)		81		10		(37)		(17)		47	[1]	(1,394)	(166)		(1,402)
Net earnings (loss) including noncontrolling interests	(25)		(28)	294		54		248		(73)		(379)		1		(7)		152		(420)	[1]	(177)	523		22
Net earnings (loss) attributable to Best Buy Co., Inc. shareholders	(14)	[5]	(33)	293		54		266		(81)		(409)		(10)		12		158		(441)	[1]	(1,425)	532		(1,231)
Adjustment for Fiscal Year-end Change (Note 2)	74		5																	(74)		(5)	0		0
Fiscal Year Change, Adjustments to Cash Flows, Financing Activities	50
Fiscal Year Change, Adjustment to Cash Flows, Investing Activities	$ 18

[1] (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.

[2] Includes $6 million, $7 million, $31 million and $115 million of restructuring charges recorded in the fiscal first, second, third and fourth quarters, respectively, and $159 million for the 12 months ended February 1, 2014, related to measures we took to restructure our businesses.

[3] (5)Includes $127 million, $91 million, $34 million and $169 million of restructuring charges recorded in the fiscal first, second, third and fourth quarters, respectively, and $415 million for the 11 months ended February 2, 2013, related to measures we took to restructure our businesses. Also included in the fourth quarter and 11 months ended February 2, 2013, is a $822 million goodwill impairment charge related to our Canada, Five Star and U.S. reporting units.

[4] (1)The calculation of diluted loss per share for fiscal 2013 (11-month) does not include potentially dilutive securities because their inclusion would be anti-dilutive (i.e., reduce the net loss per share).

[5] (1)The net loss attributable to Best Buy Co., Inc. shareholders for the one month ended January 31, 2012, represents the adjustment to retained earnings within the Consolidated Statements of Changes in Shareholders' Equity as a result of the exclusion of January results for entities reported on a lag.