Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring Charges (Composition of Restructuring Charges) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Nov. 02, 2019	Nov. 03, 2018	Nov. 02, 2019	Nov. 03, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (7)		$ 41	$ 47
Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0		47
Cumulative Amount	56		56
Best Buy Mobile [Member] \| Property and equipment impairments [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative Amount	1		1
Best Buy Mobile [Member] \| Termination benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				(2)
Cumulative Amount	6		6
Best Buy Mobile [Member] \| Facility closure and other costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 49
Cumulative Amount	$ 49		$ 49