Restructuring Charges Composition of Restructuring Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 10	$ 39	$ 198
Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(2)	3	200
Restructuring and Related Cost, Cost Incurred to Date	201
Restructuring Program Canadian Brand Consolidation [Member] | Inventory write-downs [Member] | International Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	3
Restructuring and Related Cost, Cost Incurred to Date	3
Restructuring Program Canadian Brand Consolidation [Member] | Employee Severance [Member] | International Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	25
Restructuring and Related Cost, Cost Incurred to Date	25
Restructuring Program Canadian Brand Consolidation [Member] | Property and equipment write-downs [Member] | International Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	30
Restructuring and Related Cost, Cost Incurred to Date	30
Restructuring Program Canadian Brand Consolidation [Member] | Impairment of Intangible Assets Related to Restructuring [Member] | International Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	40
Restructuring and Related Cost, Cost Incurred to Date	40
Restructuring Program Canadian Brand Consolidation [Member] | Facility Closing [Member] | International Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(2)	3	102
Restructuring and Related Cost, Cost Incurred to Date	103
Restructuring Program Renew Blue Phase 2 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	26	0
Restructuring Program Renew Blue Phase 2 [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		18
Restructuring Program Renew Blue Phase 2 [Member] | Property and equipment write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		8
Restructuring Program Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	9	$ 0	$ 0
Restructuring Program Best Buy Mobile [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	8
Restructuring Program Best Buy Mobile [Member] | Property and equipment write-downs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1