Restructuring Charges Other Restructuring (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								11 Months Ended	12 Months Ended
	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May 03, 2014	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	May 04, 2013	Feb. 02, 2013	Jan. 31, 2015		Feb. 01, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (7)	$ 5	$ 5	$ 2	$ 113	$ 27	$ 4	$ 5	$ 449	$ 23		$ 259
Restructuring charges									414	5		149
Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									415	5		149
Discontinued Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									34	18		110
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	34				58				158	34		58
Restructuring charges									278	(6)		94
Restructuring and Related Cost, Cost Incurred to Date	875									875
Restructuring charges										3		42
Payments for Restructuring										(21)		(90)
Restructuring Reserve, Accrual Adjustment										(6)	[1]	(50)	[1]
Restructuring Reserve, Translation Adjustment												(2)
Other Restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0				0				4	0		0
Restructuring charges												36
Payments for Restructuring										0		(4)
Restructuring Reserve, Accrual Adjustment										0	[1]	(36)	[1]
Restructuring Reserve, Translation Adjustment												0
Other Restructuring [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	34				58				154	34		58
Restructuring charges										3		6
Payments for Restructuring										(21)		(86)
Restructuring Reserve, Accrual Adjustment										(6)	[1]	(14)	[1]
Restructuring Reserve, Translation Adjustment												(2)
Other Restructuring [Member] | Domestic Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									244	(6)		(6)
Restructuring and Related Cost, Cost Incurred to Date	350									350
Other Restructuring [Member] | International [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									34	0		100
Restructuring and Related Cost, Cost Incurred to Date	525									525
Other Restructuring [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									244	(6)		(6)
Restructuring and Related Cost, Cost Incurred to Date	427									427
Other Restructuring [Member] | Continuing Operations [Member] | Property and equipment write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									17
Restructuring and Related Cost, Cost Incurred to Date	161									161
Other Restructuring [Member] | Continuing Operations [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									77	0		0
Restructuring and Related Cost, Cost Incurred to Date	91									91
Other Restructuring [Member] | Continuing Operations [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									150	(6)		(6)
Restructuring and Related Cost, Cost Incurred to Date	147									147
Other Restructuring [Member] | Continuing Operations [Member] | Inventory write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Restructuring and Related Cost, Cost Incurred to Date	28									28
Other Restructuring [Member] | Continuing Operations [Member] | Domestic Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									244	(6)		(6)
Restructuring and Related Cost, Cost Incurred to Date	315									315
Other Restructuring [Member] | Continuing Operations [Member] | Domestic Segment [Member] | Property and equipment write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									17	0		0
Restructuring and Related Cost, Cost Incurred to Date	49									49
Other Restructuring [Member] | Continuing Operations [Member] | Domestic Segment [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									77	0		0
Restructuring and Related Cost, Cost Incurred to Date	91									91
Other Restructuring [Member] | Continuing Operations [Member] | Domestic Segment [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									150	(6)		(6)
Restructuring and Related Cost, Cost Incurred to Date	147									147
Other Restructuring [Member] | Continuing Operations [Member] | Domestic Segment [Member] | Inventory write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Restructuring and Related Cost, Cost Incurred to Date	28									28
Other Restructuring [Member] | Continuing Operations [Member] | International [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Restructuring and Related Cost, Cost Incurred to Date	112									112
Other Restructuring [Member] | Continuing Operations [Member] | International [Member] | Property and equipment write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Restructuring and Related Cost, Cost Incurred to Date	112									112
Other Restructuring [Member] | Continuing Operations [Member] | International [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Other Restructuring [Member] | Continuing Operations [Member] | International [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Restructuring and Related Cost, Cost Incurred to Date	0									0
Other Restructuring [Member] | Continuing Operations [Member] | International [Member] | Inventory write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Restructuring and Related Cost, Cost Incurred to Date	0									0
Other Restructuring [Member] | Discontinued Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									34	0		100
Restructuring and Related Cost, Cost Incurred to Date	448									448
Other Restructuring [Member] | Discontinued Operations [Member] | Property and equipment write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									12	0		45
Restructuring and Related Cost, Cost Incurred to Date	203									203
Other Restructuring [Member] | Discontinued Operations [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									20	0		36
Restructuring and Related Cost, Cost Incurred to Date	95									95
Other Restructuring [Member] | Discontinued Operations [Member] | Impairment of Intangible Assets Related to Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges												4
Restructuring and Related Cost, Cost Incurred to Date	17									17
Other Restructuring [Member] | Discontinued Operations [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									2	0		8
Restructuring and Related Cost, Cost Incurred to Date	100									100
Other Restructuring [Member] | Discontinued Operations [Member] | Inventory write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		7
Restructuring and Related Cost, Cost Incurred to Date	33									33
Other Restructuring [Member] | Discontinued Operations [Member] | Domestic Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Restructuring and Related Cost, Cost Incurred to Date	35									35
Other Restructuring [Member] | Discontinued Operations [Member] | Domestic Segment [Member] | Property and equipment write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Restructuring and Related Cost, Cost Incurred to Date	15									15
Other Restructuring [Member] | Discontinued Operations [Member] | Domestic Segment [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Restructuring and Related Cost, Cost Incurred to Date	4									4
Other Restructuring [Member] | Discontinued Operations [Member] | Domestic Segment [Member] | Impairment of Intangible Assets Related to Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	13									13
Other Restructuring [Member] | Discontinued Operations [Member] | Domestic Segment [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Restructuring and Related Cost, Cost Incurred to Date	3									3
Other Restructuring [Member] | Discontinued Operations [Member] | Domestic Segment [Member] | Inventory write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		0
Restructuring and Related Cost, Cost Incurred to Date	0									0
Other Restructuring [Member] | Discontinued Operations [Member] | International [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									34	0		100
Restructuring and Related Cost, Cost Incurred to Date	413									413
Other Restructuring [Member] | Discontinued Operations [Member] | International [Member] | Property and equipment write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									12	0		45
Restructuring and Related Cost, Cost Incurred to Date	188									188
Other Restructuring [Member] | Discontinued Operations [Member] | International [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									20	0		36
Restructuring and Related Cost, Cost Incurred to Date	91									91
Other Restructuring [Member] | Discontinued Operations [Member] | International [Member] | Impairment of Intangible Assets Related to Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges												4
Restructuring and Related Cost, Cost Incurred to Date	4									4
Other Restructuring [Member] | Discontinued Operations [Member] | International [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									2	0		8
Restructuring and Related Cost, Cost Incurred to Date	97									97
Other Restructuring [Member] | Discontinued Operations [Member] | International [Member] | Inventory write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0	0		7
Restructuring and Related Cost, Cost Incurred to Date	$ 33									$ 33

[1] Adjustments to termination benefits in fiscal 2014 were primarily due to the write-off of the remaining liability as a result of the sale of Best Buy Europe. Adjustments to facility closure and other costs represent change in sublease assumptions and reductions in our remaining lease obligations.