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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 02, 2019
Feb. 03, 2018
Jan. 28, 2017
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 2,000,000    
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 $ 30.21    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Number 400,000.0    
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 $ 52.01    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2,358,000 3,069,000  
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 $ 33.47 $ 32.32  
Numerator [Abstract]      
Net earnings from continuing operations attributable to Best Buy Co., Inc., diluted $ 1,464 $ 999 $ 1,207
Denominator [Abstract]      
Weighted-average common shares outstanding (in shares) 276,400,000 300,400,000 318,500,000
Effect of Potentially Dilutive Securities [Abstract]      
Stock options and other 5,000,000 6,700,000 4,100,000
Weighted-average common shares outstanding, assuming dilution (in shares) 281,400,000 307,100,000 322,600,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 200,000 0 4,500,000
Earnings per share attributable to Best Buy Co., Inc.      
Basic (in dollars per share) $ 5.30 $ 3.33 $ 3.79
Diluted (in dollars per share) $ 5.20 $ 3.26 $ 3.74
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 2,000,000    
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 $ 30.21    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Number 300,000.0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Percentage 75.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Weighted Average Exercise Price $ 43.86    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2,300,000.0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Percentage 96.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 31.72    
Out of 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    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Percentage 0.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Number 100,000.0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Percentage 25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Weighted Average Exercise Price $ 71.52    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 100,000.0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Percentage 4.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 71.52