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, six months ended	350	340	0	0	340	0	10
Foreign currency translation adjustments	152	127	0	0	0	127	25
Unrealized losses (gains) on available-for-sale investments	1	1	0	0	0	1	0
Cash flow hedging instruments - unrealized gains (losses)	2	0	0	0	0	0	2
Dividend distribution	(4)	0	0	0	0	0	(4)
Stock-based compensation	67	67	0	67	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)			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	(8)	(8)	0	(8)	0	0	0
Common stock dividends, $0.32 per share during the period ended August 4, 2012 and $0.30 per share during the period ended July 30, 2011, respectively	(113)	(113)	0	0	(113)	0	0
Repurchase of common stock (in shares)			(25)
Repurchase of common stock	(750)	(750)	(2)	(110)	(638)	0	0
Ending balances at Jul. 30, 2011	6,887	6,164	37	0	5,846	281	723
Ending balances (in shares) at Jul. 30, 2011			370
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, six months ended	145	170	0	0	170		(25)
Foreign currency translation adjustments	9	9	0	0	0	9	0
Unrealized losses (gains) on available-for-sale investments	3	3	0	0	0	3	0
Stock-based compensation	64	64	0	64	0	0	0
Stock options exercised (in shares)			1
Stock options exercised	1	1	0	1	0	0	0
Issuance of common stock under employee stock purchase plan (in shares)			1
Issuance of common stock under employee stock purchase plan	14	14	0	14	0	0	0
Tax benefit (deficit) from stock options exercised, restricted stock vesting and employee stock purchase plan	(23)	(23)	0	(15)	(8)	0	0
Common stock dividends, $0.32 per share during the period ended August 4, 2012 and $0.30 per share during the period ended July 30, 2011, respectively	(107)	(107)	0	0	(107)	0	0
Repurchase of common stock (in shares)			(11)
Repurchase of common stock	(237)	(237)	0	(64)	(173)	0	0
Ending balances at Aug. 04, 2012	$ 4,111	$ 3,515	$ 34	$ 0	$ 3,395	$ 86	$ 596
Ending balances (in shares) at Aug. 04, 2012			337