Shareholders' Equity (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Feb. 03, 2024	Jan. 28, 2023	Jan. 29, 2022
Numerator [Abstract]
Net earnings	$ 1,241.0	$ 1,419.0	$ 2,454.0
Denominator [Abstract]
Weighted-average common shares outstanding (in shares)	217.7	224.8	246.8
Effect of Potentially Dilutive Securities [Abstract]
Dilutive effect of stock compensation plan awards (in shares)	0.8	0.9	2.5
Weighted-average common shares outstanding, assuming dilution (in shares)	218.5	225.7	249.3
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)	$ 5.70	$ 6.31	$ 9.94
Diluted (in dollars per share)	$ 5.68	$ 6.29	$ 9.84