Condensed Consolidating Financial Information (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 26, 2011	Nov. 27, 2010	Nov. 26, 2011	Nov. 27, 2010
Revenue	$ 12,099	$ 11,890	$ 34,386	$ 34,016
Cost of goods sold	9,155	8,907	25,802	25,322
Restructuring charges - cost of goods sold	13	0	13	0
Gross profit	2,931	2,983	8,571	8,694
Selling, general and administrative expenses	2,616	2,598	7,683	7,585
Restructuring charges	137	0	141	0
Operating income (loss)	178	385	747	1,109
Other income (expense)
Gain on sale of investments	55	0	55	0
Investment income and other	8	8	26	33
Interest expense	(37)	(20)	(102)	(64)
Earnings (loss) before equity in earnings (loss) of subsidiaries	204	373	726	1,078
Equity in earnings (loss) of subsidiaries	0	0	0	0
Earnings (loss) before income tax expense and equity in loss of affiliates	204	373	726	1,078
Income tax expense (benefit)	72	133	270	400
Equity in loss of affiliates	(1)	0	(2)	0
Net earnings (loss) including noncontrolling interests	131	240	454	678
Net loss (earnings) attributable to noncontrolling interests	23	(23)	13	(52)
Net earnings (loss) attributable to Best Buy Co., Inc.	154	217	467	626
Best Buy Co., Inc.
Revenue	4	4	12	12
Cost of goods sold	0	0	0	0
Restructuring charges - cost of goods sold	0		0
Gross profit	4	4	12	12
Selling, general and administrative expenses	33	36	106	107
Restructuring charges	0		0
Operating income (loss)	(29)	(32)	(94)	(95)
Other income (expense)
Gain on sale of investments	0		0
Investment income and other	4	12	14	31
Interest expense	(25)	(12)	(71)	(35)
Earnings (loss) before equity in earnings (loss) of subsidiaries	(50)	(32)	(151)	(99)
Equity in earnings (loss) of subsidiaries	100	202	420	584
Earnings (loss) before income tax expense and equity in loss of affiliates	50	170	269	485
Income tax expense (benefit)	(57)	6	(54)	0
Equity in loss of affiliates	0		0
Net earnings (loss) including noncontrolling interests	107	164	323	485
Net loss (earnings) attributable to noncontrolling interests	0	0	0	0
Net earnings (loss) attributable to Best Buy Co., Inc.	107	164	323	485
Guarantor Subsidiary
Revenue	8,039	7,984	22,838	23,059
Cost of goods sold	6,063	5,962	17,061	17,081
Restructuring charges - cost of goods sold	0		0
Gross profit	1,976	2,022	5,777	5,978
Selling, general and administrative expenses	1,896	1,941	5,551	5,747
Restructuring charges	0		(2)
Operating income (loss)	80	81	228	231
Other income (expense)
Gain on sale of investments	0		0
Investment income and other	0	0	0	0
Interest expense	(3)	(4)	(9)	(10)
Earnings (loss) before equity in earnings (loss) of subsidiaries	77	77	219	221
Equity in earnings (loss) of subsidiaries	18	7	36	30
Earnings (loss) before income tax expense and equity in loss of affiliates	95	84	255	251
Income tax expense (benefit)	28	26	77	79
Equity in loss of affiliates	0		0
Net earnings (loss) including noncontrolling interests	67	58	178	172
Net loss (earnings) attributable to noncontrolling interests	0	0	0	0
Net earnings (loss) attributable to Best Buy Co., Inc.	67	58	178	172
Non-Guarantor Subsidiaries
Revenue	12,886	13,469	33,055	34,166
Cost of goods sold	11,420	11,994	28,788	29,750
Restructuring charges - cost of goods sold	13		13
Gross profit	1,453	1,475	4,254	4,416
Selling, general and administrative expenses	1,236	1,192	3,642	3,584
Restructuring charges	137		143
Operating income (loss)	80	283	469	832
Other income (expense)
Gain on sale of investments	55		55
Investment income and other	8	8	25	33
Interest expense	(13)	(16)	(35)	(50)
Earnings (loss) before equity in earnings (loss) of subsidiaries	130	275	514	815
Equity in earnings (loss) of subsidiaries	49	51	142	142
Earnings (loss) before income tax expense and equity in loss of affiliates	179	326	656	957
Income tax expense (benefit)	101	101	247	321
Equity in loss of affiliates	(1)		(2)
Net earnings (loss) including noncontrolling interests	77	225	407	636
Net loss (earnings) attributable to noncontrolling interests	23	(23)	13	(52)
Net earnings (loss) attributable to Best Buy Co., Inc.	100	202	420	584
Eliminations
Revenue	(8,830)	(9,567)	(21,519)	(23,221)
Cost of goods sold	(8,328)	(9,049)	(20,047)	(21,509)
Restructuring charges - cost of goods sold	0		0
Gross profit	(502)	(518)	(1,472)	(1,712)
Selling, general and administrative expenses	(549)	(571)	(1,616)	(1,853)
Restructuring charges	0		0
Operating income (loss)	47	53	144	141
Other income (expense)
Gain on sale of investments	0		0
Investment income and other	(4)	(12)	(13)	(31)
Interest expense	4	12	13	31
Earnings (loss) before equity in earnings (loss) of subsidiaries	47	53	144	141
Equity in earnings (loss) of subsidiaries	(167)	(260)	(598)	(756)
Earnings (loss) before income tax expense and equity in loss of affiliates	(120)	(207)	(454)	(615)
Income tax expense (benefit)	0	0	0	0
Equity in loss of affiliates	0		0
Net earnings (loss) including noncontrolling interests	(120)	(207)	(454)	(615)
Net loss (earnings) attributable to noncontrolling interests	0	0	0	0
Net earnings (loss) attributable to Best Buy Co., Inc.	$ (120)	$ (207)	$ (454)	$ (615)