Discontinued Operations (Details 2) £ in Millions, $ in Millions		3 Months Ended										12 Months Ended
		Jan. 30, 2016 USD ($)	Oct. 31, 2015 USD ($)	Aug. 01, 2015 USD ($)	May. 02, 2015 USD ($)	Jan. 31, 2015 USD ($)	Nov. 01, 2014 USD ($)	Aug. 02, 2014 USD ($)	May. 03, 2014 USD ($)	Aug. 03, 2013 USD ($)	Aug. 03, 2013 GBP (£)	Jan. 30, 2016 USD ($)	Jan. 31, 2015 USD ($)	Jan. 31, 2015 GBP (£)	Feb. 01, 2014 USD ($)		Jan. 31, 2015 GBP (£)	Feb. 28, 2009
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
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
Future Cash Consideration from Divestiture of Business, Due within Two Years										$ 39	£ 25
Interest Rate on Future Cash Consideration from Divestiture of Business										2.50%	2.50%
Revenue												$ 217	$ 1,564		$ 4,615
Restructuring charges	[1]											1	18		110
Gain (loss) from discontinued operations before income tax benefit												(8)	(12)		(235)	[2]
Income tax benefit												(1)	0		31	[3]
Gain on sale of discontinued operations	[4]											99	1		32
Net gain (loss) from discontinued operations including noncontrolling interests		$ 2	$ (4)	$ 0	$ 92	$ (4)	$ (9)	$ 10	$ (8)			90	(11)		(172)
Net (earnings) loss from discontinued operations attributable to noncontrolling interests												0	(2)		9
Net gain (loss) from discontinued operations attributable to Best Buy Co., Inc.												90	(13)		(163)
Income Tax Expense (Benefit), Intraperiod Tax Allocation															27
Other Tax Expense (Benefit)															15
Derivative, Notional Amount		$ 1,052				$ 554						1,052	554
Net Proceeds from Divestiture of Businesses | £														£ 471
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments												$ (4)	(12)
Best Buy Europe [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of discontinued operations															24
Best Buy Europe fixed line of Business in Switzerland [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of discontinued operations															28
Domestic [Member] | mindSHIFT [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of discontinued operations															(18)
Best Buy Europe [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired																		50.00%
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of Long-Lived Assets to be Disposed of															$ 175
Discontinued Operations [Member] | Not Designated as Hedging Instrument [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Derivative, Notional Amount | £																	£ 455
Operating Expense [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments													$ (2)

[1] See Note 4, Restructuring Charges, for further discussion of the restructuring charges associated with discontinued operations.

[2] Includes a $175 million impairment to write down the book value of our investment in Best Buy Europe to fair value in fiscal 2014.

[3] Income tax benefit for fiscal 2014 includes a $27 million benefit related to a tax allocation between continuing and discontinued operations and a $15 million benefit related to the impairment of our investment in Best Buy Europe. The fiscal 2014 effective tax rate for discontinued operations differs from the statutory tax rate primarily due to the previously mentioned tax allocation, sale of mindSHIFT, restructuring charges and the impairment of our investment in Best Buy Europe. The sale of mindSHIFT, restructuring charges and impairment generally included no related tax benefit. The deferred tax assets related to the sale of mindSHIFT and restructuring charges generally resulted in an increase in the valuation allowance in an equal amount, of which the investment impairment is not tax deductible.

[4] Gain in fiscal 2014 is primarily comprised of the following: $28 million gain (with no tax impact) from sale of Best Buy Europe fixed-line business in Switzerland in the first quarter; $24 million gain (with no tax impact) from the sale of Best Buy Europe in the second quarter; and loss of $18 million from sale of mindSHIFT in the fourth quarter. Gain in fiscal 2016 of $99 million is from sale of Five Star in the first quarter.