Goodwill and Intangible Assets (Details 4) (USD $) In Millions, unless otherwise specified	Nov. 26, 2011
Best Buy Europe [Member]
Noncontrolling Interest [Line Items]
Purchase price for profit share-based management fee buyout, pending CPW shareholder approval	$ 1,300
Goodwill, impairment loss, pending transaction approval	$ 1,200
Carphone Warehouse Group PLC (CPW)
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	50.00%