Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Jan. 29, 2022 USD ($) segment	Jan. 30, 2021 USD ($)	Feb. 01, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of Operating Segments | segment	2
Cash Equivalents, at Carrying Value	$ 1,584,000,000	$ 3,559,000,000
Weighted Average Interest Rate on Cash Equivalents	0.20%	0.60%
Allowances for uncollectible receivables	$ 39,000,000	$ 38,000,000
Write-offs	52,000,000	88,000,000
Goodwill	$ 1,384,000,000	$ 986,000,000
Percentage of Commissions on Sale of Extended Warranties to Revenue	1.40%	1.60%	1.80%
Gift card redemption within 1 year, percentage	90.00%
Revenue recognized	$ 924,000,000	$ 923,000,000
Period of Expiration for Customer Loyalty Certificates, Low End of Range	2 months
Period of Expiration for Customer Loyalty Certificates, High End of Range	6 months
Advertising expense	$ 915,000,000	$ 819,000,000	$ 840,000,000
Branded cards	25.00%	25.00%	25.00%
CARES Act, Qualified Deferred Payroll Taxes		$ 142,000,000
CARES Act, Employee Retention Credits		81,000,000
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	893,000,000
Best Buy Domestic [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill	491,000,000
Best Buy Gift Cards [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue recognized	$ 49,000,000	$ 33,000,000	$ 35,000,000
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