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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Feb. 03, 2018
Oct. 28, 2017
Jul. 29, 2017
Apr. 29, 2017
Jan. 28, 2017
Oct. 29, 2016
Jul. 30, 2016
Apr. 30, 2016
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 3,069,000       6,987,000       3,069,000 6,987,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 32.32       $ 36.61       $ 32.32 $ 36.61  
Numerator [Abstract]                      
Net earnings from continuing operations attributable to Best Buy Co., Inc., diluted                 $ 999 $ 1,207 $ 807
Denominator [Abstract]                      
Weighted-average common shares outstanding (in shares)                 300,400,000 318,500,000 346,500,000
Effect of Potentially Dilutive Securities [Abstract]                      
Stock options and other                 6,700,000 4,100,000 4,200,000
Weighted-average common shares outstanding, assuming dilution (in shares)                 307,100,000 322,600,000 350,700,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount                 0 4,500,000 8,900,000
Earnings per share attributable to Best Buy Co., Inc.                      
Basic (in dollars per share)                 $ 3.33 $ 3.79 $ 2.33
Diluted (in dollars per share) $ 1.23 $ 0.78 $ 0.67 $ 0.60 $ 1.91 $ 0.60 $ 0.56 $ 0.69 $ 3.26 $ 3.74 $ 2.30
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 2,400,000.0               2,400,000.0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Percentage 100.00%               100.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 30.40               $ 30.40    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Number 700,000.0               700,000.0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Percentage 100.00%               100.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Unexercisable, Weighted Average Exercise Price $ 39.71               $ 39.71    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 3,100,000.0               3,100,000.0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Percentage 100.00%               100.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 32.32               $ 32.32