Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Jan. 31, 2026 USD ($) revenue_category segment reporting_unit	Feb. 01, 2025 USD ($)	Feb. 03, 2024 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments | segment	2
Number of revenue categories | revenue_category	6
Allowances for uncollectible receivables	$ 24	$ 26
Write-offs	$ 50	48
Number of reporting units | reporting_unit	2
Goodwill	$ 790	$ 908
Percentage of commissions on sale of extended warranties to revenue	0.90%	0.90%	0.80%
Branded cards	25.00%	25.00%	25.00%
Profit share on sale of extended warranties	1.20%	1.10%	1.40%
Gift card redemption within 1 year, percentage	90.00%
Customer loyalty program, certificate expiration period	2 months
Advertising costs	$ 861	$ 846	$ 794
2028 Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt	500
Best Buy Domestic
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill	492	492
Best Buy Health
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill	$ 298	$ 416
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Support service, contract period	1 month
Extended warranty, term	1 month
Minimum | Software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives	2 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Support service, contract period	1 year
Extended warranty, term	5 years
Maximum | Software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives	5 years