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, three months ended	239	212	0	0	212	0	27
Foreign currency translation adjustments	145	125	0	0	0	125	20
Unrealized losses (gains) on available-for-sale investments	(6)	(6)	0	0	0	(6)	0
Cash flow hedging instruments - unrealized gains (losses)	4	2	0	0	0	2	2
Dividend distribution	(4)	0	0	0	0	0	(4)
Stock-based compensation	37	37	0	37	0	0	0
Stock options exercised (in shares)			1
Stock options exercised	25	25	0	25	0	0	0
Issuance of common stock under employee stock purchase plan (in shares)			1
Issuance of common stock under employee stock purchase plan	23	23	0	23	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, $0.16 per share during the period ended May 5, 2012 and $0.15 per share during the period ended April 30, 2011, respectively	(57)	(57)	0	0	(57)	0	0
Repurchase of common stock (in shares)			(11)
Repurchase of common stock	(325)	(325)	(1)	(87)	(237)	0	0
Ending balances at Apr. 30, 2011	7,222	6,487	38	0	6,175	274	735
Ending balances (in shares) at Apr. 30, 2011			384
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	34	0	3,513	74	621
Beginning balances (in shares) at Jan. 28, 2012			346
Increase (Decrease) in Shareholders' Equity
Net earnings, three months ended	152	158	0	0	158	0	(6)
Foreign currency translation adjustments	43	23	0	0	0	23	20
Unrealized losses (gains) on available-for-sale investments	1	1	0	0	0	1	0
Stock-based compensation	33	33	0	33	0	0	0
Issuance of common stock under employee stock purchase plan (in shares)			1
Issuance of common stock under employee stock purchase plan	13	13	0	13	0	0	0
Tax benefit (deficit) from stock options exercised, restricted stock vesting and employee stock purchase plan	(9)	(9)	0	(9)	0	0	0
Common stock dividends, $0.16 per share during the period ended May 5, 2012 and $0.15 per share during the period ended April 30, 2011, respectively	(53)	(53)	0	0	(53)	0	0
Repurchase of common stock (in shares)			(5)
Repurchase of common stock	(115)	(115)	0	(17)	(98)	0	0
Ending balances at May. 05, 2012	$ 4,307	$ 3,672	$ 34	$ 20	$ 3,520	$ 98	$ 635
Ending balances (in shares) at May. 05, 2012			342