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Shareholders' Equity (Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 01, 2020
Feb. 02, 2019
Feb. 03, 2018
Numerator [Abstract]      
Net earnings from continuing operations attributable to Best Buy Co., Inc., diluted $ 1,541 $ 1,464 $ 999
Denominator [Abstract]      
Weighted-average common shares outstanding (in shares) 264,900,000 276,400,000 300,400,000
Effect of Potentially Dilutive Securities [Abstract]      
Dilutive effect of stock compensation plan awards 3,200,000 5,000,000.0 6,700,000
Weighted-average common shares outstanding, assuming dilution 268,100,000 281,400,000 307,100,000
Potential shares which were anti-dilutive and excluded from weighted-average share computations 800,000 200,000  
Earnings per share attributable to Best Buy Co., Inc.      
Basic (in dollars per share) $ 5.82 $ 5.30 $ 3.33
Diluted (in dollars per share) $ 5.75 $ 5.20 $ 3.26
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 0.7    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Percentage 100.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 38.29    
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 100.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Weighted Average Exercise Price $ 67.04    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1.6    
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 $ 54.38