Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 03, 2012	Feb. 26, 2011	Feb. 27, 2010
Related Party Transaction [Line Items]
Payment made to Carphone Warehouse for their share of the profit share agreement buy-out (see Note 2, Profit Share Buy-Out)	$ 1,303	$ 0	$ 0
Discount from fair value of noncontrolling interests right to purchase joint venture within contract period, as a percent	10.00%
Carphone Warehouse Group plc [Member] | Best Buy Europe Distributions Limited [Member]
Related Party Transaction [Line Items]
Payment made to Carphone Warehouse for their share of the profit share agreement buy-out (see Note 2, Profit Share Buy-Out)	1,303	0	0
Revenue earned (primarily commission revenue and fees for information technology services provided to CPW and Carphone Warehouse)	0	6	63
SG&A incurred (primarily for rent and other payroll-related costs paid to CPW and Carphone Warehouse)	20	8	6
Interest expense incurred on credit facility with CPW and Carphone Warehouse as lender	1	1	4
Accounts payable to CPW and Carphone Warehouse at the end of the fiscal year	0	0	4
Accounts receivable from CPW and Carphone Warehouse at the end of the fiscal year	1	2	31
Balance outstanding on credit facility from CPW and Carphone Warehouse at the end of the fiscal year	$ 0	$ 98	$ 206