Restructuring Charges Restructuring Narrative (Details) $ in Millions	3 Months Ended									9 Months Ended	12 Months Ended
	Feb. 02, 2019 USD ($)	Nov. 03, 2018 USD ($)	Aug. 04, 2018 USD ($)	May 05, 2018 USD ($)	Feb. 03, 2018 USD ($)	Oct. 28, 2017 USD ($)	Jul. 29, 2017 USD ($)	Apr. 29, 2017 USD ($)	May 02, 2015 store	Nov. 03, 2018 store	Feb. 02, 2019 USD ($)	Feb. 03, 2018 USD ($)	Jan. 28, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1	$ 0	$ 17	$ 30	$ 10	$ 2	$ 2	$ 0			$ 46	$ 10	$ 39
Best Buy Mobile
Restructuring Cost and Reserve [Line Items]
Number of Stores to be Closed | store										257
Restructuring charges											47	9	0
Restructuring reserve	1				8						1	8	0
Restructuring and Related Cost, Cost Incurred to Date	56										56
Renew Blue Phase 2
Restructuring Cost and Reserve [Line Items]
Restructuring charges											0	0	26
Canadian brand consolidation
Restructuring Cost and Reserve [Line Items]
Number of Stores to be Closed | store									66
Restructuring charges											1	2	3
Number of Future Shop stores converted to Best Buy stores | store									65
Restructuring and Related Cost, Cost Incurred to Date	200										200
Renew Blue
Restructuring Cost and Reserve [Line Items]
Restructuring charges											0	3	5
Restructuring and Related Cost, Cost Incurred to Date	371										371
Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges											0	0	5
Property and equipment impairments | Best Buy Mobile
Restructuring Cost and Reserve [Line Items]
Restructuring charges											0	1
Restructuring and Related Cost, Cost Incurred to Date	1										1
Property and equipment impairments | Renew Blue Phase 2
Restructuring Cost and Reserve [Line Items]
Restructuring charges													8
Employee termination benefits | Best Buy Mobile
Restructuring Cost and Reserve [Line Items]
Restructuring charges											2	8
Restructuring reserve	0				8						0	8	0
Restructuring and Related Cost, Cost Incurred to Date	6										6
Employee termination benefits | Renew Blue Phase 2
Restructuring Cost and Reserve [Line Items]
Restructuring charges													18
Facility closure and other costs | Best Buy Mobile
Restructuring Cost and Reserve [Line Items]
Restructuring charges											49	0
Restructuring reserve	1				0						1	0	0
Restructuring and Related Cost, Cost Incurred to Date	49										49
Facility closure and other costs | Canadian brand consolidation
Restructuring Cost and Reserve [Line Items]
Restructuring charges											1	2	3
Restructuring reserve	7				$ 15						7	$ 15	$ 34
Facility closure and other costs | Renew Blue
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	7										7
Facility closure and other costs | Other
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 2										$ 2