Shareholders' Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Feb. 01, 2025	Feb. 03, 2024	Jan. 28, 2023
Numerator [Abstract]
Net earnings	$ 927.0	$ 1,241.0	$ 1,419.0
Denominator [Abstract]
Weighted-average common shares outstanding (in shares)	215.2	217.7	224.8
Effect of Potentially Dilutive Securities [Abstract]
Dilutive effect of stock compensation plan awards (in shares)	1.4	0.8	0.9
Weighted-average common shares outstanding, assuming dilution (in shares)	216.6	218.5	225.7
Potential shares which were anti-dilutive and excluded from weighted-average share computations (in shares)			0.7
Earnings per share attributable to Best Buy Co., Inc.
Basic (in dollars per share)	$ 4.31	$ 5.70	$ 6.31
Diluted (in dollars per share)	$ 4.28	$ 5.68	$ 6.29