Discontinued Operations Discontinued Operations (Details) - Operating Activities [Domain] - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Aug. 01, 2015		Aug. 02, 2014	Aug. 01, 2015	Aug. 02, 2014	Feb. 13, 2015
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue	$ 5	[1]	$ 437	$ 217	$ 834
Restructuring Charges Related to Discontinued Operations	0		0	0	1
Gain (loss) from discontinued operations before income tax benefit	0		15	(10)	4
Income tax benefit (expense)	0		(7)	3	(4)
Gain on sale of discontinued operations	0		2	99	2
Net gain from discontinued operations, including noncontrolling interests	0		10	92	2
Net earnings from discontinued operations attributable to noncontrolling interests	0		(1)	0	(1)
Net gain from discontinued operations attributable to Best Buy Co., Inc. shareholders	$ 0		$ 9	$ 92	$ 1
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

[1] The $5 million of revenue for the three months ended August 1, 2015, represents the final sales associated with our China retail business.