Restructuring - Schedule of Composition of Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2026	Feb. 01, 2025	Feb. 03, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 190	$ (3)	$ 153
Fiscal 2026 Labor and Store Optimization Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges		117	0
Fiscal 2026 Labor and Store Optimization Initiative | Domestic
Restructuring Cost and Reserve [Line Items]
Restructuring charges		114
Fiscal 2026 Labor and Store Optimization Initiative | International
Restructuring Cost and Reserve [Line Items]
Restructuring charges		3
Best Buy Health Optimization and China Sourcing Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 101	101	0	0
2024 Resource Optimization Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(28)	3	171
Cumulative Amount	146	146
2024 Resource Optimization Initiative | Domestic
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(26)	3	163
Cumulative Amount	140	140
2024 Resource Optimization Initiative | International
Restructuring Cost and Reserve [Line Items]
Restructuring charges		(2)	$ 0	$ 8
Cumulative Amount	6	6
Termination benefits | Fiscal 2026 Labor and Store Optimization Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges		71
Termination benefits | Fiscal 2026 Labor and Store Optimization Initiative | Domestic
Restructuring Cost and Reserve [Line Items]
Restructuring charges		68
Termination benefits | Fiscal 2026 Labor and Store Optimization Initiative | International
Restructuring Cost and Reserve [Line Items]
Restructuring charges		3
Termination benefits | Best Buy Health Optimization and China Sourcing Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	30
Asset impairments and other costs | Fiscal 2026 Labor and Store Optimization Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges		46
Asset impairments and other costs | Fiscal 2026 Labor and Store Optimization Initiative | Domestic
Restructuring Cost and Reserve [Line Items]
Restructuring charges		46
Asset impairments and other costs | Fiscal 2026 Labor and Store Optimization Initiative | International
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0
Asset impairments and other costs | Best Buy Health Optimization and China Sourcing Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 71