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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 |  |

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