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Shareholders' Equity (Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jan. 30, 2021
Feb. 01, 2020
Feb. 02, 2019
Numerator [Abstract]      
Net earnings from continuing operations attributable to Best Buy Co., Inc., diluted $ 1,798 $ 1,541 $ 1,464
Denominator [Abstract]      
Weighted-average common shares outstanding (in shares) 259.6 264.9 276.4
Effect of Potentially Dilutive Securities [Abstract]      
Dilutive effect of stock compensation plan awards (in shares) 3.4 3.2 5.0
Weighted-average common shares outstanding, assuming dilution (in shares) 263.0 268.1 281.4
Potential shares which were anti-dilutive and excluded from weighted-average share computations (in shares)   0.8 0.2
Earnings per share attributable to Best Buy Co., Inc.      
Basic (in dollars per share) $ 6.93 $ 5.82 $ 5.30
Diluted (in dollars per share) $ 6.84 $ 5.75 $ 5.20
In the Money Stock Options [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 0.4    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Percentage 32.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 44.85    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Number 0.9    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Percentage 68.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Weighted Average Exercise Price $ 63.98    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1.3    
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 $ 57.83