Shareholders' Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 28, 2023	Jan. 29, 2022	Jan. 30, 2021
Numerator [Abstract]
Net earnings	$ 1,419.0	$ 2,454.0	$ 1,798.0
Denominator [Abstract]
Weighted-average common shares outstanding (in shares)	224.8	246.8	259.6
Effect of Potentially Dilutive Securities [Abstract]
Dilutive effect of stock compensation plan awards (in shares)	0.9	2.5	3.4
Weighted-average common shares outstanding, assuming dilution (in shares)	225.7	249.3	263.0
Potential shares which were anti-dilutive and excluded from weighted-average share computations (in shares)	0.7	0.1
Earnings per share attributable to Best Buy Co., Inc.
Basic (in dollars per share)	$ 6.31	$ 9.94	$ 6.93
Diluted (in dollars per share)	$ 6.29	$ 9.84	$ 6.84