Supplementary Financial Information (Details) (USD $) In Millions, except Per Share data, 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
Quarterly Financial Information [Line Items]
Revenue				$ 14,470		$ 9,327		$ 9,266		$ 9,347		$ 14,921		$ 9,343		$ 9,306		$ 10,343		$ 39,827	[1]	$ 41,311	$ 42,410		$ 45,457
Comparable store sales % change (as a percent)				(1.20%)	[2]	0.30%	[2]	(0.60%)	[2]	(1.40%)	[2]	(1.40%)	[2]	(5.10%)	[2]	(3.30%)	[2]	(5.20%)	[2]	(3.40%)	[1],[2]		(0.80%)	[2]
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	[3]	90	[3]	413	[3]	168	[3]	(181)	[4]	0	[4]	87	[4]	263	[4]	(119)	[1],[4]	1,898	1,140	[3]	2,200
Net earnings (loss) from continuing operations	(13)		0	311		44		237		97		(460)		(9)		30		169		(467)	[1],[5]	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.	(14)	[6]	(33)	293		54		266		(81)		(409)		(10)		12		158		(441)	[1]	(1,425)	532		(1,231)
Diluted earnings (loss) per share
Continuing operations				$ 0.88		$ 0.12		$ 0.69		$ 0.29		$ (1.36)		$ (0.03)		$ 0.09		$ 0.49		$ (1.38)	[1],[5]	$ 3.19	$ 1.98		$ 3.81
Discontinued operations				$ (0.05)	[7]	$ 0.04	[7]	$ 0.08	[7]	$ (0.53)	[7]	$ 0.15	[7]	$ 0.00	[7]	$ (0.05)	[7]	$ (0.03)	[7]	$ 0.08	[1],[7]	$ (6.91)	$ (0.45)	[7]	$ (7.08)
Diluted (in dollars per share)				$ 0.83		$ 0.16		$ 0.77		$ (0.24)		$ (1.21)		$ (0.03)		$ 0.04		$ 0.46		$ (1.30)	[1]	$ (3.72)	$ 1.53		$ (3.27)
Months until inclusion in comparable store sales																							14 months
Restructuring charges				115		31		7		6		169		34		91		127		449		280	259		287
Goodwill impairments																				822		0	0		0
Continuing Operations [Member]
Diluted earnings (loss) per share
Restructuring charges																				$ 415			$ 159		$ 48

[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] Comprised of revenue from stores operating for at least 14 full months, as well as revenue related to call centers, websites and our other comparable sales channels. Revenue we earn from sales of merchandise to wholesalers or dealers is generally not included within our comparable store sales calculation. Relocated, remodeled and expanded stores are excluded from our comparable store sales calculation until at least 14 full months after reopening. Acquired stores are included in our comparable store sales calculation beginning with the first full quarter following the first anniversary of the date of the acquisition. The portion of our calculation of the comparable store sales percentage change attributable to our International segment excludes the effect of fluctuations in foreign currency exchange rates. The method of calculating comparable store sales varies across the retail industry. As a result, our method of calculating comparable store sales may not be the same as other retailers' methods. The calculation of comparable store sales excludes the impact of the extra week of revenue in the fourth quarter of fiscal 2012, as well as revenue from discontinued operations for all periods presented.

[3] 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.

[4] (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.

[5] (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).

[6] (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.

[7] The sum of our quarterly diluted earnings per share does not equal our annual diluted earnings per share due to the impact of the timing of the repurchases of common stock and stock option exercises on quarterly and annual weighted-average shares outstanding.