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. 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 1) (in shares)			5
Adjustment for fiscal year-end change (Note 1)	(124)	(124)	0	0	(108)	(16)	0
Foreign currency translation adjustments	(15)
Unrealized gains (losses) on available-for-sale investments	(1)
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 (loss), six months ended	145	170	0	0	170	0	(25)
Foreign currency translation adjustments	9	9	0	0	0	9	0
Foreign currency translation adjustments		9
Unrealized gains (losses) on available-for-sale investments	3	3	0	0	0	3	0
Reclassification of foreign currency translation adjustments into earnings	0
Reclassification of losses on available-for-sale investments into earnings	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 deficit from stock options canceled or exercised, restricted stock vesting and employee stock purchase plan	(23)	(23)	0	(15)	(8)	0	0
Common stock dividends, $0.34 per share during the period ended August 3, 2013 and $0.32 per share during the period ended August 4, 2012, respectively	(107)	(107)	0	0	(107)	0	0
Repurchase and retirement of common stock (in shares)			(11)
Repurchase and retirement 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
Beginning balances at May. 05, 2012
Increase (Decrease) in Shareholders' Equity
Net earnings (loss), six months ended	(7)
Foreign currency translation adjustments	(34)
Foreign currency translation adjustments		(14)
Unrealized gains (losses) on available-for-sale investments	2	2
Reclassification of foreign currency translation adjustments into earnings	0
Reclassification of losses on available-for-sale investments into earnings	0
Ending balances at Aug. 04, 2012	4,111	3,515
Beginning balances at Feb. 02, 2013	3,715	3,061	34	54	2,861	112	654
Beginning balances (in shares) at Feb. 02, 2013			338
Increase (Decrease) in Shareholders' Equity
Net earnings (loss), six months ended	175	185	0	0	185	0	(10)
Foreign currency translation adjustments	(104)
Foreign currency translation adjustments	(104)	(93)	0	0	0	(93)	(11)
Unrealized gains (losses) on available-for-sale investments	0	1	0	0	0	1	(1)
Sale of noncontrolling interest	(776)	0	0	0	0	0	(776)
Reclassification of foreign currency translation adjustments into earnings	654	(508)	0	0	0	(508)	(146)
Reclassification of losses on available-for-sale investments into earnings	2	(1)	0	0	0	(1)	(1)
Stock-based compensation	48	48	0	48	0	0	0
Stock options exercised (in shares)			2
Stock options exercised	14	14	0	14	0	0	0
Issuance of common stock under employee stock purchase plan (in shares)			1
Issuance of common stock under employee stock purchase plan	8	8	0	8	0	0	0
Tax deficit from stock options canceled or exercised, restricted stock vesting and employee stock purchase plan	(15)	(15)	0	(15)	0	0	0
Common stock dividends, $0.34 per share during the period ended August 3, 2013 and $0.32 per share during the period ended August 4, 2012, respectively	(116)	(116)	0	0	(116)	0	0
Ending balances at Aug. 03, 2013	3,605	3,602	34	109	2,930	529	3
Ending balances (in shares) at Aug. 03, 2013			341
Beginning balances at May. 04, 2013
Increase (Decrease) in Shareholders' Equity
Net earnings (loss), six months ended	248
Foreign currency translation adjustments	(41)
Foreign currency translation adjustments		(60)
Unrealized gains (losses) on available-for-sale investments	(3)	(2)
Reclassification of foreign currency translation adjustments into earnings	654	(508)
Reclassification of losses on available-for-sale investments into earnings	2	(1)
Ending balances at Aug. 03, 2013	$ 3,605	$ 3,602