Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Jan. 28, 2023 USD ($) segment	Jan. 29, 2022 USD ($)	Jan. 30, 2021 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of Operating Segments | segment	2
Allowances for uncollectible receivables	$ 30,000,000	$ 39,000,000
Write-offs	41,000,000	52,000,000
Goodwill	$ 1,383,000,000	$ 1,384,000,000
Percentage of Commissions on Sale of Extended Warranties to Revenue	0.90%	1.40%	1.60%
Gift card redemption within 1 year, percentage	90.00%
Revenue recognized	$ 1,346,000,000	$ 924,000,000
Period of Expiration for Customer Loyalty Certificates, Low End of Range	2 months
Advertising expense	$ 864,000,000	$ 915,000,000	$ 819,000,000
Branded cards	25.00%	25.00%	25.00%
2028 Notes [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt	$ 500,000,000
Best Buy Health [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill	891,000,000
Best Buy Domestic [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill	492,000,000
Best Buy Gift Cards [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue recognized	$ 59,000,000	$ 49,000,000	$ 33,000,000
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term of contract	1 month
Customer loyalty program, certificate expiration period	1 month
Minimum [Member] | Software [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives	2 years
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term of contract	1 year
Customer loyalty program, certificate expiration period	5 years
Maximum [Member] | Software [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives	5 years