Discontinued Operations Discontinued Operations (Details) In Millions, unless otherwise specified	0 Months Ended			3 Months Ended				6 Months Ended					0 Months Ended		6 Months Ended
	Jul. 03, 2013 USD ($)	Jun. 26, 2013 USD ($)	Jun. 26, 2013 GBP (£)	Aug. 02, 2014 USD ($)		Aug. 03, 2013 USD ($)		Aug. 02, 2014 USD ($)		Aug. 03, 2013 USD ($)		Feb. 28, 2009 Best Buy Europe [Member]	Jun. 26, 2013 June 26, 2015 [Member]	Jun. 26, 2013 June 26, 2014 [Member]	Aug. 02, 2014 Discontinued Operations [Member] USD ($)	Aug. 03, 2013 Discontinued Operations [Member] USD ($)
Discontinued Operation, Additional Disclosures [Abstract]
Business Acquisition, Percentage of Voting Interests Acquired												50.00%
Proceeds from Divestiture of Businesses		$ 526	£ 341
Dollar Amount of Shares Received from Divestiture of Business		123	80
Future Cash Consideration from Divestiture of Business, Due within One Year		39	25
Interest Rate on Future Cash Consideration from Divestiture of Business													2.50%	2.50%
Future Cash Consideration from Divestiture of Business, Due within Two Years		39	25
Dollar Amount of Shares Sold from Divestiture of Business	123
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue				0		1,287		0		2,750
Restructuring charges				0	[1]	47	[1]	0	[1]	100	[1]				0	100
Loss from discontinued operations before income tax benefit				0		(51)		0		(235)
Income tax benefit				0		38	[2]	0		24	[2]
Gain on sale of discontinued operations				2		24		2		52
Income tax expense on sale				(1)		0		(1)		0
Net gain (loss) from discontinued operations, including noncontrolling interests				1		11		1		(159)
Net loss from discontinued operations attributable to noncontrolling interests				0		18		0		10
Net gain (loss) from discontinued operations attributable to Best Buy Co., Inc. shareholders				1		29		1		(149)
Income Tax Expense (Benefit), Intraperiod Tax Allocation						27
Impairment of assets held for sale										$ 175

[1] See Note 5, Restructuring Charges, for further discussion of the restructuring charges associated with discontinued operations.

[2] The effective tax rate for discontinued operations for the three and six months ended August 3, 2013 differs from the statutory tax rate primarily due to the previously mentioned tax allocation, restructuring charges and the $175 million impairment of our investment in Best Buy Europe, which generally included no related tax benefit. The deferred tax assets related to the restructuring charges generally resulted in an increase in the valuation allowance in an equal amount, while the investment impairment is not tax deductible.