Condensed Consolidating Financial Information (Details 4) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Nov. 26, 2011	Nov. 27, 2010
Total cash provided by (used in) operating activities	$ 2,627	$ 545
Investing activities
Additions to property and equipment	(616)	(529)
Purchases of investments	(111)	(245)
Sales of investments	167	383
Proceeds from sale of business	0	21
Change in restricted assets	(31)	(1)
Other, net	(7)	10
Total cash provided by (used in) investing activities	(598)	(361)
Financing activities
Repurchase of common stock	(1,165)	(1,128)
Borrowings of debt	2,438	1,925
Repayments of debt	(1,870)	(1,884)
Dividends paid	(172)	(178)
Issuance of common stock under employee stock purchase plan and for the exercise of stock options	64	171
Other, net	(22)	1
Change in intercompany receivable/payable	0	0
Total cash provided by (used in) financing activities	(727)	(1,093)
Effect of exchange rate changes on cash	(13)	8
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1,289	(901)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,103	1,826
CASH AND CASH EQUIVALENTS AT END OF PERIOD	2,392	925
Best Buy Co., Inc.
Total cash provided by (used in) operating activities	(26)	(410)
Investing activities
Additions to property and equipment	(4)	0
Purchases of investments	(91)	(245)
Sales of investments	128	382
Proceeds from sale of business		0
Change in restricted assets	0	0
Other, net	2	0
Total cash provided by (used in) investing activities	35	137
Financing activities
Repurchase of common stock	(1,165)	(1,128)
Borrowings of debt	997	500
Repayments of debt	(15)	(1)
Dividends paid	(172)	(178)
Issuance of common stock under employee stock purchase plan and for the exercise of stock options	64	171
Other, net	(12)	13
Change in intercompany receivable/payable	1,261	(130)
Total cash provided by (used in) financing activities	958	(753)
Effect of exchange rate changes on cash	0	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	967	(1,026)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	282	1,170
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,249	144
Guarantor Subsidiary
Total cash provided by (used in) operating activities	(2,501)	(3,758)
Investing activities
Additions to property and equipment	(318)	(199)
Purchases of investments	0	0
Sales of investments	0	0
Proceeds from sale of business		0
Change in restricted assets	0	0
Other, net	0	0
Total cash provided by (used in) investing activities	(318)	(199)
Financing activities
Repurchase of common stock	0	0
Borrowings of debt	0	0
Repayments of debt	(10)	(10)
Dividends paid	0	0
Issuance of common stock under employee stock purchase plan and for the exercise of stock options	0	0
Other, net	0	0
Change in intercompany receivable/payable	2,998	4,094
Total cash provided by (used in) financing activities	2,988	4,084
Effect of exchange rate changes on cash	0	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	169	127
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	51	53
CASH AND CASH EQUIVALENTS AT END OF PERIOD	220	180
Non-Guarantor Subsidiaries
Total cash provided by (used in) operating activities	5,154	4,713
Investing activities
Additions to property and equipment	(294)	(330)
Purchases of investments	(20)	0
Sales of investments	39	1
Proceeds from sale of business		21
Change in restricted assets	(31)	(1)
Other, net	(9)	10
Total cash provided by (used in) investing activities	(315)	(299)
Financing activities
Repurchase of common stock	0	0
Borrowings of debt	1,441	1,425
Repayments of debt	(1,845)	(1,873)
Dividends paid	0	0
Issuance of common stock under employee stock purchase plan and for the exercise of stock options	0	0
Other, net	(10)	(12)
Change in intercompany receivable/payable	(4,259)	(3,964)
Total cash provided by (used in) financing activities	(4,673)	(4,424)
Effect of exchange rate changes on cash	(13)	8
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	153	(2)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	770	603
CASH AND CASH EQUIVALENTS AT END OF PERIOD	923	601
Eliminations
Total cash provided by (used in) operating activities	0	0
Investing activities
Additions to property and equipment	0	0
Purchases of investments	0	0
Sales of investments	0	0
Proceeds from sale of business		0
Change in restricted assets	0	0
Other, net	0	0
Total cash provided by (used in) investing activities	0	0
Financing activities
Repurchase of common stock	0	0
Borrowings of debt	0	0
Repayments of debt	0	0
Dividends paid	0	0
Issuance of common stock under employee stock purchase plan and for the exercise of stock options	0	0
Other, net	0	0
Change in intercompany receivable/payable	0	0
Total cash provided by (used in) financing activities	0	0
Effect of exchange rate changes on cash	0	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0	0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 0	$ 0