Shareholders' Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 29, 2022	Jan. 30, 2021	Feb. 01, 2020
Earnings per Share [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	0.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Percentage	35.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 43.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Number	0.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Percentage	65.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Weighted Average Exercise Price	$ 64.80
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	0.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Percentage	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 57.39
Numerator [Abstract]
Net earnings	$ 2,454	$ 1,798	$ 1,541
Denominator [Abstract]
Weighted-average common shares outstanding (in shares)	246.8	259.6	264.9
Effect of Potentially Dilutive Securities [Abstract]
Dilutive effect of stock compensation plan awards (in shares)	2.5	3.4	3.2
Weighted-average common shares outstanding, assuming dilution (in shares)	249.3	263.0	268.1
Potential shares which were anti-dilutive and excluded from weighted-average share computations (in shares)	0.1		0.8
Earnings per share attributable to Best Buy Co., Inc.
Basic (in dollars per share)	$ 9.94	$ 6.93	$ 5.82
Diluted (in dollars per share)	$ 9.84	$ 6.84	$ 5.75