Discontinued Operations Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014	Feb. 13, 2015
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue	$ 0	$ 347	$ 217	$ 1,181
Restructuring Charges Related to Discontinued Operations	0	4	0	5
Loss from discontinued operations before income tax benefit (expense)	(4)	(12)	(14)	(8)
Income tax benefit (expense)	0	3	3	(1)
Gain on sale of discontinued operations	0	0	99	2
Net gain (loss) from discontinued operations, including noncontrolling interests	(4)	(9)	88	(7)
Net earnings from discontinued operations attributable to noncontrolling interests	0	0	0	(1)
Net gain (loss) from discontinued operations attributable to Best Buy Co., Inc. shareholders	$ (4)	$ (9)	$ 88	$ (8)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Cash and cash equivalents					$ 125
Receivables					113
Merchandise inventories					252
All other assets					461
Total assets					951
Accounts payable					478
All other liabilities					128
Total liabilities					$ 606