CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified	Total	Total Best Buy Co., Inc. [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Beginning balances at Jan. 29, 2011	$ 7,139	$ 6,449	$ 39	$ 0	$ 6,257	$ 153	$ 690
Beginning balances (in shares) at Jan. 29, 2011			393
Increase (Decrease) in Shareholders' Equity
Adjustment for fiscal year-end change (note 2) (in shares)			0
Adjustment for fiscal year-end change (note 2)	(153)	(153)	0	(18)	(115)	(20)	0
Ending balances at Feb. 26, 2011	7,292	6,602	39	18	6,372	173	690
Ending balances (in shares) at Feb. 26, 2011			393
Beginning balances at Jan. 29, 2011	7,139	6,449	39	0	6,257	153	690
Beginning balances (in shares) at Jan. 29, 2011			393
Increase (Decrease) in Shareholders' Equity
Net earnings, nine months ended	524	496	0	0	496	0	28
Foreign currency translation adjustments	5	10	0	0	0	10	(5)
Unrealized (gains) losses on available-for-sale investments	(18)	(18)	0	0	0	(18)	0
Cash flow hedging instruments - unrealized gains (losses)	0	0	0	0	0	0	0
Dividend distribution	(7)	0	0	0	0	0	(7)
Stock-based compensation	99	99	0	99	0	0	0
Stock options exercised (in shares)			1
Stock options exercised	28	28	0	28	0	0	0
Issuance of common stock under employee stock purchase plan (in shares)			2
Issuance of common stock under employee stock purchase plan	39	39	0	39	0	0	0
Tax benefit (deficit) from stock options exercised, restricted stock vesting and employee stock purchase plan	(2)	(2)	0	(2)	0	0	0
Common stock dividends, $0.49 per share during the period ended November 3, 2012 and $0.46 per share during the period ended October 29, 2011, respectively	(171)	(171)	0	0	(171)	0	0
Repurchase of common stock (in shares)			(38)
Repurchase of common stock	(1,073)	(1,073)	(3)	(164)	(906)	0	0
Ending balances at Oct. 29, 2011	6,563	5,857	36	0	5,676	145	706
Ending balances (in shares) at Oct. 29, 2011			358
Beginning balances at Jan. 28, 2012	4,242	3,621	34	0	3,513	74	621
Beginning balances (in shares) at Jan. 28, 2012			346
Increase (Decrease) in Shareholders' Equity
Adjustment for fiscal year-end change (note 2) (in shares)			5
Adjustment for fiscal year-end change (note 2)	(124)	(124)	0	0	(108)	(16)	0
Ending balances at Mar. 03, 2012	4,366	3,745	34	0	3,621	90	621
Ending balances (in shares) at Mar. 03, 2012			341
Beginning balances at Jan. 28, 2012	4,242	3,621		0	3,513	74	621
Increase (Decrease) in Shareholders' Equity
Net earnings, nine months ended	146	160		0	160		(14)
Ending balances at Aug. 04, 2012
Beginning balances at Jan. 28, 2012	4,242	3,621	34	0	3,513	74	621
Beginning balances (in shares) at Jan. 28, 2012			346
Increase (Decrease) in Shareholders' Equity
Net earnings, nine months ended	146		0
Foreign currency translation adjustments	42	28	0	0	0	28	14
Unrealized (gains) losses on available-for-sale investments	3	3	0	0	0	3	0
Stock-based compensation	99	99	0	99	0	0	0
Stock options exercised (in shares)			2
Stock options exercised	2	2	0	2	0	0	0
Issuance of common stock under employee stock purchase plan (in shares)			1
Issuance of common stock under employee stock purchase plan	24	24	0	24	0	0	0
Tax benefit (deficit) from stock options exercised, restricted stock vesting and employee stock purchase plan	(29)	(29)	0	(29)	0	0	0
Common stock dividends, $0.49 per share during the period ended November 3, 2012 and $0.46 per share during the period ended October 29, 2011, respectively	(164)	(164)	0	0	(164)	0	0
Repurchase of common stock (in shares)			(11)
Repurchase of common stock	(237)	(237)	0	(56)	(181)	0	0
Ending balances at Nov. 03, 2012	$ 4,128	$ 3,507	$ 34	$ 40	$ 3,328	$ 105	$ 621
Ending balances (in shares) at Nov. 03, 2012			338