Shareholders' Equity (Details 2) (USD $)	1 Months Ended				3 Months Ended								11 Months Ended			12 Months Ended
	Jan. 31, 2012	Jun. 30, 2011	Jan. 31, 2011	Jun. 30, 2007	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	Feb. 26, 2011
Outstanding Options to Purchase Common Stock [Line Items]
Net cash proceeds from the exercise of stock options (in dollars)													$ 1,000,000			$ 158,000,000	$ 27,000,000
Weighted-average grant-date fair value of stock options granted (in dollars per share)													$ 5.11			$ 7.77	$ 7.94
Exercisable stock options (in shares)					16,926,000											16,926,000
Percentage of exercisable stock options (as a percent)					100.00%											100.00%
Exercisable stock options, weighted-average price (in dollars per share)					$ 40.11											$ 40.11
Unexercisable stock options (in shares)					5,200,000.0											5,200,000.0
Percentage of unexercisable stock options (as a percent)					100.00%											100.00%
Unexercisable stock options, weighted-average price (in dollars per share)					$ 24.16											$ 24.16
Total outstanding stock options (in shares)					22,101,000				29,983,000				29,983,000			22,101,000
Percentage of outstanding stock options (as a percent)					100.00%											100.00%
Outstanding stock options, weighted-average price (in dollars per share)					$ 36.38				$ 36.93				$ 36.93			$ 36.38
Numerator [Abstract]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	(13,000,000)		0		311,000,000	44,000,000	237,000,000	97,000,000	(460,000,000)	(9,000,000)	30,000,000	169,000,000	(467,000,000)	[1],[2]	1,217,000,000	689,000,000	1,424,000,000
Net (earnings) from continuing operations attributable to noncontrolling interests													(2,000,000)	[2]	(3,000,000)	(2,000,000)	(3,000,000)
Net (loss) earnings from continuing operations attributable to Best Buy Co., Inc., basic													(469,000,000)	[2]		687,000,000	1,421,000,000
Adjustment for assumed dilution:
Interest on convertible debentures due in 2022, net of tax													0	[2]		0	5,000,000
Net earnings from continuing operations attributable to Best Buy Co., Inc., diluted													(469,000,000)	[2]		687,000,000	1,426,000,000
Denominator [Abstract]
Weighted-average common shares outstanding (in shares)													338,600,000	[2]	372,500,000	342,100,000	366,300,000
Effect of Potentially Dilutive Securities [Abstract]
Shares from assumed conversion of convertible debentures (in shares)													0	[2]		0	7,600,000
Stock options and other (in shares)													0	[2]		5,500,000	600,000
Weighted-average common shares outstanding, assuming dilution (in shares)													338,600,000	[2]	382,000,000	347,600,000	374,500,000
Earnings per share attributable to Best Buy Co., Inc.
Basic (in dollars per share)													$ (1.38)	[2]	$ 3.26	$ 2.01	$ 3.88
Diluted (in dollars per share)					$ 0.88	$ 0.12	$ 0.69	$ 0.29	$ (1.36)	$ (0.03)	$ 0.09	$ 0.49	$ (1.38)	[1],[2]	$ 3.19	$ 1.98	$ 3.81
Share repurchases authorized (in shares)		5,000,000,000		5,500,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation					485,000,000				113,000,000				113,000,000		104,000,000	485,000,000	93,000,000	102,000,000
Unrealized gains (losses) on available-for-sale investments					7,000,000				(1,000,000)				(1,000,000)		(3,000,000)	7,000,000	(3,000,000)	71,000,000
Total					492,000,000				112,000,000				112,000,000		101,000,000	492,000,000	90,000,000	173,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value													0			39,000,000	6,000,000
Actual income tax benefit realized from stock option exercises (in dollars)													0			13,000,000	2,000,000
In-the-money [Member]
Outstanding Options to Purchase Common Stock [Line Items]
Exercisable stock options (in shares)					2,600,000.0											2,600,000.0
Percentage of exercisable stock options (as a percent)					15.00%											15.00%
Exercisable stock options, weighted-average price (in dollars per share)					$ 23.84											$ 23.84
Unexercisable stock options (in shares)					4,300,000.0											4,300,000.0
Percentage of unexercisable stock options (as a percent)					83.00%											83.00%
Unexercisable stock options, weighted-average price (in dollars per share)					$ 21.45											$ 21.45
Total outstanding stock options (in shares)					6,900,000.0											6,900,000.0
Percentage of outstanding stock options (as a percent)					31.00%											31.00%
Outstanding stock options, weighted-average price (in dollars per share)					$ 22.36											$ 22.36
Out-of-the-money [Member]
Outstanding Options to Purchase Common Stock [Line Items]
Exercisable stock options (in shares)					14,300,000.0											14,300,000.0
Percentage of exercisable stock options (as a percent)					85.00%											85.00%
Exercisable stock options, weighted-average price (in dollars per share)					$ 43.14											$ 43.14
Unexercisable stock options (in shares)					900,000.0											900,000.0
Percentage of unexercisable stock options (as a percent)					17.00%											17.00%
Unexercisable stock options, weighted-average price (in dollars per share)					$ 36.91											$ 36.91
Total outstanding stock options (in shares)					15,200,000.0											15,200,000.0
Percentage of outstanding stock options (as a percent)					69.00%											69.00%
Outstanding stock options, weighted-average price (in dollars per share)					$ 42.77											$ 42.77
June 2011 share repurchase program [Member}
Outstanding Options to Purchase Common Stock [Line Items]
Amounting remaining for additional share repurchases																4,000,000,000
Open Market Repurchases [Abstract]
Total number of shares repurchased													6,300,000			0	34,500,000
Total cost of shares repurchased													122,000,000			0	889,000,000
June 2007 share repurchase program [Member]
Open Market Repurchases [Abstract]
Total number of shares repurchased													0			0	20,100,000
Total cost of shares repurchased													0			0	611,000,000
Market-based [Member]
Outstanding Options to Purchase Common Stock [Line Items]
Unrecognized compensation (in dollars)					$ 21,000,000											$ 21,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Weighted-average period over which compensation expense is expected to be recognized (in years)																2 years
Employee Stock [Member]
Outstanding Options to Purchase Common Stock [Line Items]
Issuance of common stock under employee stock purchase plan (in shares)													1,000,000			600,000	1,400,000

[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] (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).