Condensed Consolidating Financial Information (Details 4) (USD $) In Millions	6 Months Ended
	Aug. 27, 2011	Aug. 28, 2010
Total cash provided by (used in) operating activities	$ 1,537	$ 84
Investing activities
Additions to property and equipment	(411)	(342)
Purchases of investments	(106)	(241)
Sales of investments	66	379
Proceeds from sale of business	0	21
Change in restricted assets	(45)	12
Settlement of net investment hedges	0	12
Other, net	0	(1)
Total cash provided by (used in) investing activities	(496)	(160)
Financing activities
Repurchase of common stock	(846)	(667)
Borrowings of debt	1,996	955
Repayments of debt	(1,187)	(1,207)
Dividends paid	(115)	(118)
Issuance of common stock under employee stock purchase plan and for the exercise of stock options	49	113
Excess tax benefits from stock-based compensation	0	10
Other, net	(2)	9
Change in intercompany receivable/payable	0	0
Total cash provided by (used in) financing activities	(105)	(905)
Effect of exchange rate changes on cash	1	(2)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	937	(983)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,103	1,826
CASH AND CASH EQUIVALENTS AT END OF PERIOD	2,040	843
Best Buy Co., Inc.
Total cash provided by (used in) operating activities	(151)	199
Investing activities
Additions to property and equipment	(2)	0
Purchases of investments	(86)	(241)
Sales of investments	43	378
Proceeds from sale of business	0	0
Change in restricted assets	0	0
Settlement of net investment hedges	0	0
Other, net	0	0
Total cash provided by (used in) investing activities	(45)	137
Financing activities
Repurchase of common stock	(846)	(667)
Borrowings of debt	997	0
Repayments of debt	0	(1)
Dividends paid	(115)	(118)
Issuance of common stock under employee stock purchase plan and for the exercise of stock options	49	113
Excess tax benefits from stock-based compensation	0	10
Other, net	(8)	0
Change in intercompany receivable/payable	780	(707)
Total cash provided by (used in) financing activities	857	(1,370)
Effect of exchange rate changes on cash	0	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	661	(1,034)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	282	1,170
CASH AND CASH EQUIVALENTS AT END OF PERIOD	943	136
Guarantor Subsidiary
Total cash provided by (used in) operating activities	200	(472)
Investing activities
Additions to property and equipment	(191)	(129)
Purchases of investments	0	0
Sales of investments	0	0
Proceeds from sale of business	0	0
Change in restricted assets	0	0
Settlement of net investment hedges	0	0
Other, net	0	0
Total cash provided by (used in) investing activities	(191)	(129)
Financing activities
Repurchase of common stock	0	0
Borrowings of debt	0	0
Repayments of debt	(6)	(6)
Dividends paid	0	0
Issuance of common stock under employee stock purchase plan and for the exercise of stock options	0	0
Excess tax benefits from stock-based compensation	0	0
Other, net	0	0
Change in intercompany receivable/payable	(2)	583
Total cash provided by (used in) financing activities	(8)	577
Effect of exchange rate changes on cash	0	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1	(24)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	51	53
CASH AND CASH EQUIVALENTS AT END OF PERIOD	52	29
Non-Guarantor Subsidiaries
Total cash provided by (used in) operating activities	1,488	357
Investing activities
Additions to property and equipment	(218)	(213)
Purchases of investments	(20)	0
Sales of investments	23	1
Proceeds from sale of business	0	21
Change in restricted assets	(45)	12
Settlement of net investment hedges	0	12
Other, net	0	(1)
Total cash provided by (used in) investing activities	(260)	(168)
Financing activities
Repurchase of common stock	0	0
Borrowings of debt	999	955
Repayments of debt	(1,181)	(1,200)
Dividends paid	0	0
Issuance of common stock under employee stock purchase plan and for the exercise of stock options	0	0
Excess tax benefits from stock-based compensation	0	0
Other, net	6	9
Change in intercompany receivable/payable	(778)	124
Total cash provided by (used in) financing activities	(954)	(112)
Effect of exchange rate changes on cash	1	(2)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	275	75
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	770	603
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,045	678
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	0
Change in restricted assets	0	0
Settlement of net investment hedges	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
Excess tax benefits from stock-based compensation	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